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Finding the Fourth Proportional to 287,392.61, 431,088.87 and 87,714.02

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Solution

The fourth proportional to 287,392.61, 431,088.87 and 87,714.02 is: 131,571.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,392.61 : 431,088.87 = 87,714.02 : x
  2. Step 2: Convert to fraction form
    287,392.61/431,088.87 = 87,714.02/x
  3. Step 3: Cross multiply
    287,392.61x = 431,088.87 × 87,714.02
  4. Step 4: Simplify right side
    287,392.61x = 37,812,537,764.96
  5. Step 5: Solve for x
    x = 37,812,537,764.96/287,392.61
  6. Step 6: Final answer
    x = 131,571.02

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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.