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Finding the Fourth Proportional to 145,207.20, 217,810.80 and 86,012.40

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Solution

The fourth proportional to 145,207.20, 217,810.80 and 86,012.40 is: 129,018.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,207.20 : 217,810.80 = 86,012.40 : x
  2. Step 2: Convert to fraction form
    145,207.20/217,810.80 = 86,012.40/x
  3. Step 3: Cross multiply
    145,207.20x = 217,810.80 × 86,012.40
  4. Step 4: Simplify right side
    145,207.20x = 18,734,429,653.92
  5. Step 5: Solve for x
    x = 18,734,429,653.92/145,207.20
  6. Step 6: Final answer
    x = 129,018.60

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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.