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Finding the Fourth Proportional to 291,695.70, 437,489.55 and 81,290.10

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Solution

The fourth proportional to 291,695.70, 437,489.55 and 81,290.10 is: 121,920.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    291,695.70 : 437,489.55 = 81,290.10 : x
  2. Step 2: Convert to fraction form
    291,695.70/437,489.55 = 81,290.10/x
  3. Step 3: Cross multiply
    291,695.70x = 437,489.55 × 81,290.10
  4. Step 4: Simplify right side
    291,695.70x = 35,563,569,268.46
  5. Step 5: Solve for x
    x = 35,563,569,268.46/291,695.70
  6. Step 6: Final answer
    x = 121,920.10

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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.