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Finding the Fourth Proportional to 78,615.90, 108,487.49 and 42,805.68

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Solution

The fourth proportional to 78,615.90, 108,487.49 and 42,805.68 is: 59,070.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,615.90 : 108,487.49 = 42,805.68 : x
  2. Step 2: Convert to fraction form
    78,615.90/108,487.49 = 42,805.68/x
  3. Step 3: Cross multiply
    78,615.90x = 108,487.49 × 42,805.68
  4. Step 4: Simplify right side
    78,615.90x = 4,643,880,566.91
  5. Step 5: Solve for x
    x = 4,643,880,566.91/78,615.90
  6. Step 6: Final answer
    x = 59,070.50

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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.