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Finding the Fourth Proportional to 124,640.60, 186,960.90 and 99,987.80

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Solution

The fourth proportional to 124,640.60, 186,960.90 and 99,987.80 is: 149,981.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    124,640.60 : 186,960.90 = 99,987.80 : x
  2. Step 2: Convert to fraction form
    124,640.60/186,960.90 = 99,987.80/x
  3. Step 3: Cross multiply
    124,640.60x = 186,960.90 × 99,987.80
  4. Step 4: Simplify right side
    124,640.60x = 18,693,809,077.02
  5. Step 5: Solve for x
    x = 18,693,809,077.02/124,640.60
  6. Step 6: Final answer
    x = 149,981.70

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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.