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Finding the Fourth Proportional to 56,387.78, 84,347.91 and 42,959.17

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Solution

The fourth proportional to 56,387.78, 84,347.91 and 42,959.17 is: 64,260.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,387.78 : 84,347.91 = 42,959.17 : x
  2. Step 2: Convert to fraction form
    56,387.78/84,347.91 = 42,959.17/x
  3. Step 3: Cross multiply
    56,387.78x = 84,347.91 × 42,959.17
  4. Step 4: Simplify right side
    56,387.78x = 3,623,515,783.10
  5. Step 5: Solve for x
    x = 3,623,515,783.10/56,387.78
  6. Step 6: Final answer
    x = 64,260.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.