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Finding the Fourth Proportional to 103,639.60, 155,459.40 and 72,146.80

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Solution

The fourth proportional to 103,639.60, 155,459.40 and 72,146.80 is: 108,220.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,639.60 : 155,459.40 = 72,146.80 : x
  2. Step 2: Convert to fraction form
    103,639.60/155,459.40 = 72,146.80/x
  3. Step 3: Cross multiply
    103,639.60x = 155,459.40 × 72,146.80
  4. Step 4: Simplify right side
    103,639.60x = 11,215,898,239.92
  5. Step 5: Solve for x
    x = 11,215,898,239.92/103,639.60
  6. Step 6: Final answer
    x = 108,220.20

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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.