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Finding the Fourth Proportional to 288,103.60, 431,134.80 and 251,070.40

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Solution

The fourth proportional to 288,103.60, 431,134.80 and 251,070.40 is: 375,716.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    288,103.60 : 431,134.80 = 251,070.40 : x
  2. Step 2: Convert to fraction form
    288,103.60/431,134.80 = 251,070.40/x
  3. Step 3: Cross multiply
    288,103.60x = 431,134.80 × 251,070.40
  4. Step 4: Simplify right side
    288,103.60x = 108,245,186,689.92
  5. Step 5: Solve for x
    x = 108,245,186,689.92/288,103.60
  6. Step 6: Final answer
    x = 375,716.19

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1.5x scale

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.