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Finding the Fourth Proportional to 1,151.60, 1,724.82 and 784.76

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Solution

The fourth proportional to 1,151.60, 1,724.82 and 784.76 is: 1,175.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,151.60 : 1,724.82 = 784.76 : x
  2. Step 2: Convert to fraction form
    1,151.60/1,724.82 = 784.76/x
  3. Step 3: Cross multiply
    1,151.60x = 1,724.82 × 784.76
  4. Step 4: Simplify right side
    1,151.60x = 1,353,569.74
  5. Step 5: Solve for x
    x = 1,353,569.74/1,151.60
  6. Step 6: Final answer
    x = 1,175.38

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.