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Finding the Fourth Proportional to 103,880.40, 155,820.60 and 86,165.70

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Solution

The fourth proportional to 103,880.40, 155,820.60 and 86,165.70 is: 129,248.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,880.40 : 155,820.60 = 86,165.70 : x
  2. Step 2: Convert to fraction form
    103,880.40/155,820.60 = 86,165.70/x
  3. Step 3: Cross multiply
    103,880.40x = 155,820.60 × 86,165.70
  4. Step 4: Simplify right side
    103,880.40x = 13,426,391,073.42
  5. Step 5: Solve for x
    x = 13,426,391,073.42/103,880.40
  6. Step 6: Final answer
    x = 129,248.55

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1.5x scale

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.