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Finding the Fourth Proportional to 551,681.38, 761,320.92 and 309,963.76

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Solution

The fourth proportional to 551,681.38, 761,320.92 and 309,963.76 is: 427,750.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    551,681.38 : 761,320.92 = 309,963.76 : x
  2. Step 2: Convert to fraction form
    551,681.38/761,320.92 = 309,963.76/x
  3. Step 3: Cross multiply
    551,681.38x = 761,320.92 × 309,963.76
  4. Step 4: Simplify right side
    551,681.38x = 235,981,894,929.86
  5. Step 5: Solve for x
    x = 235,981,894,929.86/551,681.38
  6. Step 6: Final answer
    x = 427,750.33

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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.