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Finding the Fourth Proportional to 72,189.20, 108,283.80 and 30,630.80

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Solution

The fourth proportional to 72,189.20, 108,283.80 and 30,630.80 is: 45,946.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,189.20 : 108,283.80 = 30,630.80 : x
  2. Step 2: Convert to fraction form
    72,189.20/108,283.80 = 30,630.80/x
  3. Step 3: Cross multiply
    72,189.20x = 108,283.80 × 30,630.80
  4. Step 4: Simplify right side
    72,189.20x = 3,316,819,421.04
  5. Step 5: Solve for x
    x = 3,316,819,421.04/72,189.20
  6. Step 6: Final answer
    x = 45,946.20

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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.