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Finding the Fourth Proportional to 507.79, 700.75 and 286.73

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Solution

The fourth proportional to 507.79, 700.75 and 286.73 is: 395.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    507.79 : 700.75 = 286.73 : x
  2. Step 2: Convert to fraction form
    507.79/700.75 = 286.73/x
  3. Step 3: Cross multiply
    507.79x = 700.75 × 286.73
  4. Step 4: Simplify right side
    507.79x = 200,926.05
  5. Step 5: Solve for x
    x = 200,926.05/507.79
  6. Step 6: Final answer
    x = 395.69

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Find fourth proportional to 253.90, 350.38 and 143.37
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.