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Finding the Fourth Proportional to 102,438.40, 153,657.60 and 81,702.40

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Solution

The fourth proportional to 102,438.40, 153,657.60 and 81,702.40 is: 122,553.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,438.40 : 153,657.60 = 81,702.40 : x
  2. Step 2: Convert to fraction form
    102,438.40/153,657.60 = 81,702.40/x
  3. Step 3: Cross multiply
    102,438.40x = 153,657.60 × 81,702.40
  4. Step 4: Simplify right side
    102,438.40x = 12,554,194,698.24
  5. Step 5: Solve for x
    x = 12,554,194,698.24/102,438.40
  6. Step 6: Final answer
    x = 122,553.60

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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.