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Finding the Fourth Proportional to 287,079.88, 430,712.03 and 87,438.91

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Solution

The fourth proportional to 287,079.88, 430,712.03 and 87,438.91 is: 131,186.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,079.88 : 430,712.03 = 87,438.91 : x
  2. Step 2: Convert to fraction form
    287,079.88/430,712.03 = 87,438.91/x
  3. Step 3: Cross multiply
    287,079.88x = 430,712.03 × 87,438.91
  4. Step 4: Simplify right side
    287,079.88x = 37,660,990,427.09
  5. Step 5: Solve for x
    x = 37,660,990,427.09/287,079.88
  6. Step 6: Final answer
    x = 131,186.45

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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.