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Finding the Fourth Proportional to 518,515.20, 715,881.24 and 423,248.40

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Solution

The fourth proportional to 518,515.20, 715,881.24 and 423,248.40 is: 584,352.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,515.20 : 715,881.24 = 423,248.40 : x
  2. Step 2: Convert to fraction form
    518,515.20/715,881.24 = 423,248.40/x
  3. Step 3: Cross multiply
    518,515.20x = 715,881.24 × 423,248.40
  4. Step 4: Simplify right side
    518,515.20x = 302,995,589,420.02
  5. Step 5: Solve for x
    x = 302,995,589,420.02/518,515.20
  6. Step 6: Final answer
    x = 584,352.38

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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.