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Finding the Fourth Proportional to 78,456.80, 117,685.20 and 72,005.60

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Solution

The fourth proportional to 78,456.80, 117,685.20 and 72,005.60 is: 108,008.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,456.80 : 117,685.20 = 72,005.60 : x
  2. Step 2: Convert to fraction form
    78,456.80/117,685.20 = 72,005.60/x
  3. Step 3: Cross multiply
    78,456.80x = 117,685.20 × 72,005.60
  4. Step 4: Simplify right side
    78,456.80x = 8,473,993,437.12
  5. Step 5: Solve for x
    x = 8,473,993,437.12/78,456.80
  6. Step 6: Final answer
    x = 108,008.40

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1.5x scale

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.