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Finding the Fourth Proportional to 287,721.80, 431,615.10 and 88,040.60

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Solution

The fourth proportional to 287,721.80, 431,615.10 and 88,040.60 is: 132,070.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,721.80 : 431,615.10 = 88,040.60 : x
  2. Step 2: Convert to fraction form
    287,721.80/431,615.10 = 88,040.60/x
  3. Step 3: Cross multiply
    287,721.80x = 431,615.10 × 88,040.60
  4. Step 4: Simplify right side
    287,721.80x = 37,999,652,373.06
  5. Step 5: Solve for x
    x = 37,999,652,373.06/287,721.80
  6. Step 6: Final answer
    x = 132,070.81

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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.