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Finding the Fourth Proportional to 145,812.60, 218,718.90 and 90,439.80

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Solution

The fourth proportional to 145,812.60, 218,718.90 and 90,439.80 is: 135,659.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,812.60 : 218,718.90 = 90,439.80 : x
  2. Step 2: Convert to fraction form
    145,812.60/218,718.90 = 90,439.80/x
  3. Step 3: Cross multiply
    145,812.60x = 218,718.90 × 90,439.80
  4. Step 4: Simplify right side
    145,812.60x = 19,780,893,572.22
  5. Step 5: Solve for x
    x = 19,780,893,572.22/145,812.60
  6. Step 6: Final answer
    x = 135,659.70

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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.