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Finding the Fourth Proportional to 287,596.19, 431,395.40 and 87,915.80

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Solution

The fourth proportional to 287,596.19, 431,395.40 and 87,915.80 is: 131,874.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,596.19 : 431,395.40 = 87,915.80 : x
  2. Step 2: Convert to fraction form
    287,596.19/431,395.40 = 87,915.80/x
  3. Step 3: Cross multiply
    287,596.19x = 431,395.40 × 87,915.80
  4. Step 4: Simplify right side
    287,596.19x = 37,926,471,707.32
  5. Step 5: Solve for x
    x = 37,926,471,707.32/287,596.19
  6. Step 6: Final answer
    x = 131,874.04

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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.