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Finding the Fourth Proportional to 145,209.70, 217,814.55 and 86,014.90

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Solution

The fourth proportional to 145,209.70, 217,814.55 and 86,014.90 is: 129,022.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,209.70 : 217,814.55 = 86,014.90 : x
  2. Step 2: Convert to fraction form
    145,209.70/217,814.55 = 86,014.90/x
  3. Step 3: Cross multiply
    145,209.70x = 217,814.55 × 86,014.90
  4. Step 4: Simplify right side
    145,209.70x = 18,735,296,736.80
  5. Step 5: Solve for x
    x = 18,735,296,736.80/145,209.70
  6. Step 6: Final answer
    x = 129,022.35

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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.