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Finding the Fourth Proportional to 78,192.72, 107,929.80 and 62,385.84

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Solution

The fourth proportional to 78,192.72, 107,929.80 and 62,385.84 is: 86,111.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,192.72 : 107,929.80 = 62,385.84 : x
  2. Step 2: Convert to fraction form
    78,192.72/107,929.80 = 62,385.84/x
  3. Step 3: Cross multiply
    78,192.72x = 107,929.80 × 62,385.84
  4. Step 4: Simplify right side
    78,192.72x = 6,733,291,234.03
  5. Step 5: Solve for x
    x = 6,733,291,234.03/78,192.72
  6. Step 6: Final answer
    x = 86,111.48

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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.