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Finding the Fourth Proportional to 145,209.20, 217,813.80 and 86,014.40

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Solution

The fourth proportional to 145,209.20, 217,813.80 and 86,014.40 is: 129,021.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,209.20 : 217,813.80 = 86,014.40 : x
  2. Step 2: Convert to fraction form
    145,209.20/217,813.80 = 86,014.40/x
  3. Step 3: Cross multiply
    145,209.20x = 217,813.80 × 86,014.40
  4. Step 4: Simplify right side
    145,209.20x = 18,735,123,318.72
  5. Step 5: Solve for x
    x = 18,735,123,318.72/145,209.20
  6. Step 6: Final answer
    x = 129,021.60

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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.