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Finding the Fourth Proportional to 78,548.87, 108,397.89 and 42,739.13

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Solution

The fourth proportional to 78,548.87, 108,397.89 and 42,739.13 is: 58,980.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,548.87 : 108,397.89 = 42,739.13 : x
  2. Step 2: Convert to fraction form
    78,548.87/108,397.89 = 42,739.13/x
  3. Step 3: Cross multiply
    78,548.87x = 108,397.89 × 42,739.13
  4. Step 4: Simplify right side
    78,548.87x = 4,632,830,970.45
  5. Step 5: Solve for x
    x = 4,632,830,970.45/78,548.87
  6. Step 6: Final answer
    x = 58,980.24

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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.