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Finding the Fourth Proportional to 103,981.60, 155,972.40 and 90,859.60

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Solution

The fourth proportional to 103,981.60, 155,972.40 and 90,859.60 is: 136,289.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,981.60 : 155,972.40 = 90,859.60 : x
  2. Step 2: Convert to fraction form
    103,981.60/155,972.40 = 90,859.60/x
  3. Step 3: Cross multiply
    103,981.60x = 155,972.40 × 90,859.60
  4. Step 4: Simplify right side
    103,981.60x = 14,171,589,875.04
  5. Step 5: Solve for x
    x = 14,171,589,875.04/103,981.60
  6. Step 6: Final answer
    x = 136,289.40

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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.