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Finding the Fourth Proportional to 516,409.78, 712,645.85 and 286,988.47

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Solution

The fourth proportional to 516,409.78, 712,645.85 and 286,988.47 is: 396,044.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    516,409.78 : 712,645.85 = 286,988.47 : x
  2. Step 2: Convert to fraction form
    516,409.78/712,645.85 = 286,988.47/x
  3. Step 3: Cross multiply
    516,409.78x = 712,645.85 × 286,988.47
  4. Step 4: Simplify right side
    516,409.78x = 204,521,139,464.90
  5. Step 5: Solve for x
    x = 204,521,139,464.90/516,409.78
  6. Step 6: Final answer
    x = 396,044.28

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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.