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Finding the Fourth Proportional to 121,287.60, 181,931.40 and 103,572.90

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Solution

The fourth proportional to 121,287.60, 181,931.40 and 103,572.90 is: 155,359.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,287.60 : 181,931.40 = 103,572.90 : x
  2. Step 2: Convert to fraction form
    121,287.60/181,931.40 = 103,572.90/x
  3. Step 3: Cross multiply
    121,287.60x = 181,931.40 × 103,572.90
  4. Step 4: Simplify right side
    121,287.60x = 18,843,162,699.06
  5. Step 5: Solve for x
    x = 18,843,162,699.06/121,287.60
  6. Step 6: Final answer
    x = 155,359.35

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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.