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Finding the Fourth Proportional to 145,207.70, 217,811.55 and 86,012.90

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Solution

The fourth proportional to 145,207.70, 217,811.55 and 86,012.90 is: 129,019.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,207.70 : 217,811.55 = 86,012.90 : x
  2. Step 2: Convert to fraction form
    145,207.70/217,811.55 = 86,012.90/x
  3. Step 3: Cross multiply
    145,207.70x = 217,811.55 × 86,012.90
  4. Step 4: Simplify right side
    145,207.70x = 18,734,603,069.00
  5. Step 5: Solve for x
    x = 18,734,603,069.00/145,207.70
  6. Step 6: Final answer
    x = 129,019.35

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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.