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Finding the Fourth Proportional to 518,702.72, 715,866.56 and 300,959.20

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Solution

The fourth proportional to 518,702.72, 715,866.56 and 300,959.20 is: 415,356.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,702.72 : 715,866.56 = 300,959.20 : x
  2. Step 2: Convert to fraction form
    518,702.72/715,866.56 = 300,959.20/x
  3. Step 3: Cross multiply
    518,702.72x = 715,866.56 × 300,959.20
  4. Step 4: Simplify right side
    518,702.72x = 215,446,627,204.35
  5. Step 5: Solve for x
    x = 215,446,627,204.35/518,702.72
  6. Step 6: Final answer
    x = 415,356.66

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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.