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Finding the Fourth Proportional to 145,010.20, 217,515.30 and 85,815.40

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Solution

The fourth proportional to 145,010.20, 217,515.30 and 85,815.40 is: 128,723.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,010.20 : 217,515.30 = 85,815.40 : x
  2. Step 2: Convert to fraction form
    145,010.20/217,515.30 = 85,815.40/x
  3. Step 3: Cross multiply
    145,010.20x = 217,515.30 × 85,815.40
  4. Step 4: Simplify right side
    145,010.20x = 18,666,162,475.62
  5. Step 5: Solve for x
    x = 18,666,162,475.62/145,010.20
  6. Step 6: Final answer
    x = 128,723.10

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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.