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Finding the Fourth Proportional to 72,013.20, 108,019.80 and 45,747.60

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Solution

The fourth proportional to 72,013.20, 108,019.80 and 45,747.60 is: 68,621.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,013.20 : 108,019.80 = 45,747.60 : x
  2. Step 2: Convert to fraction form
    72,013.20/108,019.80 = 45,747.60/x
  3. Step 3: Cross multiply
    72,013.20x = 108,019.80 × 45,747.60
  4. Step 4: Simplify right side
    72,013.20x = 4,941,646,602.48
  5. Step 5: Solve for x
    x = 4,941,646,602.48/72,013.20
  6. Step 6: Final answer
    x = 68,621.40

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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.