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Finding the Fourth Proportional to 78,436.80, 117,655.20 and 53,553.60

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Solution

The fourth proportional to 78,436.80, 117,655.20 and 53,553.60 is: 80,330.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,436.80 : 117,655.20 = 53,553.60 : x
  2. Step 2: Convert to fraction form
    78,436.80/117,655.20 = 53,553.60/x
  3. Step 3: Cross multiply
    78,436.80x = 117,655.20 × 53,553.60
  4. Step 4: Simplify right side
    78,436.80x = 6,300,859,518.72
  5. Step 5: Solve for x
    x = 6,300,859,518.72/78,436.80
  6. Step 6: Final answer
    x = 80,330.40

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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.