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Finding the Fourth Proportional to 123,041.20, 169,820.40 and 72,065.20

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Solution

The fourth proportional to 123,041.20, 169,820.40 and 72,065.20 is: 99,463.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,041.20 : 169,820.40 = 72,065.20 : x
  2. Step 2: Convert to fraction form
    123,041.20/169,820.40 = 72,065.20/x
  3. Step 3: Cross multiply
    123,041.20x = 169,820.40 × 72,065.20
  4. Step 4: Simplify right side
    123,041.20x = 12,238,141,090.08
  5. Step 5: Solve for x
    x = 12,238,141,090.08/123,041.20
  6. Step 6: Final answer
    x = 99,463.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.