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Finding the Fourth Proportional to 78,561.90, 108,416.43 and 42,752.88

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Solution

The fourth proportional to 78,561.90, 108,416.43 and 42,752.88 is: 58,999.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,561.90 : 108,416.43 = 42,752.88 : x
  2. Step 2: Convert to fraction form
    78,561.90/108,416.43 = 42,752.88/x
  3. Step 3: Cross multiply
    78,561.90x = 108,416.43 × 42,752.88
  4. Step 4: Simplify right side
    78,561.90x = 4,635,114,621.82
  5. Step 5: Solve for x
    x = 4,635,114,621.82/78,561.90
  6. Step 6: Final answer
    x = 58,999.52

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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.