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Finding the Fourth Proportional to 518,403.90, 715,404.58 and 288,954.84

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Solution

The fourth proportional to 518,403.90, 715,404.58 and 288,954.84 is: 398,761.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,403.90 : 715,404.58 = 288,954.84 : x
  2. Step 2: Convert to fraction form
    518,403.90/715,404.58 = 288,954.84/x
  3. Step 3: Cross multiply
    518,403.90x = 715,404.58 × 288,954.84
  4. Step 4: Simplify right side
    518,403.90x = 206,719,615,949.17
  5. Step 5: Solve for x
    x = 206,719,615,949.17/518,403.90
  6. Step 6: Final answer
    x = 398,761.69

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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.