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Finding the Fourth Proportional to 287,381.40, 431,072.04 and 87,702.84

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Solution

The fourth proportional to 287,381.40, 431,072.04 and 87,702.84 is: 131,554.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,381.40 : 431,072.04 = 87,702.84 : x
  2. Step 2: Convert to fraction form
    287,381.40/431,072.04 = 87,702.84/x
  3. Step 3: Cross multiply
    287,381.40x = 431,072.04 × 87,702.84
  4. Step 4: Simplify right side
    287,381.40x = 37,806,242,152.59
  5. Step 5: Solve for x
    x = 37,806,242,152.59/287,381.40
  6. Step 6: Final answer
    x = 131,554.24

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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.