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Finding the Fourth Proportional to 145,813.60, 218,720.40 and 90,440.80

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Solution

The fourth proportional to 145,813.60, 218,720.40 and 90,440.80 is: 135,661.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,813.60 : 218,720.40 = 90,440.80 : x
  2. Step 2: Convert to fraction form
    145,813.60/218,720.40 = 90,440.80/x
  3. Step 3: Cross multiply
    145,813.60x = 218,720.40 × 90,440.80
  4. Step 4: Simplify right side
    145,813.60x = 19,781,247,952.32
  5. Step 5: Solve for x
    x = 19,781,247,952.32/145,813.60
  6. Step 6: Final answer
    x = 135,661.20

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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.