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Finding the Fourth Proportional to 103,549.20, 154,978.20 and 72,445.20

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Solution

The fourth proportional to 103,549.20, 154,978.20 and 72,445.20 is: 108,426.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,549.20 : 154,978.20 = 72,445.20 : x
  2. Step 2: Convert to fraction form
    103,549.20/154,978.20 = 72,445.20/x
  3. Step 3: Cross multiply
    103,549.20x = 154,978.20 × 72,445.20
  4. Step 4: Simplify right side
    103,549.20x = 11,227,426,694.64
  5. Step 5: Solve for x
    x = 11,227,426,694.64/103,549.20
  6. Step 6: Final answer
    x = 108,426.01

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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.