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Finding the Fourth Proportional to 287,393.12, 431,089.62 and 87,714.52

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Solution

The fourth proportional to 287,393.12, 431,089.62 and 87,714.52 is: 131,571.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,393.12 : 431,089.62 = 87,714.52 : x
  2. Step 2: Convert to fraction form
    287,393.12/431,089.62 = 87,714.52/x
  3. Step 3: Cross multiply
    287,393.12x = 431,089.62 × 87,714.52
  4. Step 4: Simplify right side
    287,393.12x = 37,812,819,095.28
  5. Step 5: Solve for x
    x = 37,812,819,095.28/287,393.12
  6. Step 6: Final answer
    x = 131,571.76

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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.