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Finding the Fourth Proportional to 72,809.20, 109,213.80 and 28,437.40

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Solution

The fourth proportional to 72,809.20, 109,213.80 and 28,437.40 is: 42,656.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,809.20 : 109,213.80 = 28,437.40 : x
  2. Step 2: Convert to fraction form
    72,809.20/109,213.80 = 28,437.40/x
  3. Step 3: Cross multiply
    72,809.20x = 109,213.80 × 28,437.40
  4. Step 4: Simplify right side
    72,809.20x = 3,105,756,516.12
  5. Step 5: Solve for x
    x = 3,105,756,516.12/72,809.20
  6. Step 6: Final answer
    x = 42,656.10

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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.