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Finding the Fourth Proportional to 903.92, 1,247.40 and 505.62

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Solution

The fourth proportional to 903.92, 1,247.40 and 505.62 is: 697.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.92 : 1,247.40 = 505.62 : x
  2. Step 2: Convert to fraction form
    903.92/1,247.40 = 505.62/x
  3. Step 3: Cross multiply
    903.92x = 1,247.40 × 505.62
  4. Step 4: Simplify right side
    903.92x = 630,710.39
  5. Step 5: Solve for x
    x = 630,710.39/903.92
  6. Step 6: Final answer
    x = 697.75

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Double scale
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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.