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Finding the Fourth Proportional to 291,820.80, 437,731.20 and 81,458.40

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Solution

The fourth proportional to 291,820.80, 437,731.20 and 81,458.40 is: 122,187.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    291,820.80 : 437,731.20 = 81,458.40 : x
  2. Step 2: Convert to fraction form
    291,820.80/437,731.20 = 81,458.40/x
  3. Step 3: Cross multiply
    291,820.80x = 437,731.20 × 81,458.40
  4. Step 4: Simplify right side
    291,820.80x = 35,656,883,182.08
  5. Step 5: Solve for x
    x = 35,656,883,182.08/291,820.80
  6. Step 6: Final answer
    x = 122,187.60

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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.