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Finding the Fourth Proportional to 103,680.40, 155,405.40 and 56,966.80

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Solution

The fourth proportional to 103,680.40, 155,405.40 and 56,966.80 is: 85,386.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,680.40 : 155,405.40 = 56,966.80 : x
  2. Step 2: Convert to fraction form
    103,680.40/155,405.40 = 56,966.80/x
  3. Step 3: Cross multiply
    103,680.40x = 155,405.40 × 56,966.80
  4. Step 4: Simplify right side
    103,680.40x = 8,852,948,340.72
  5. Step 5: Solve for x
    x = 8,852,948,340.72/103,680.40
  6. Step 6: Final answer
    x = 85,386.90

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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.