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Finding the Fourth Proportional to 143,876.10, 215,814.15 and 128,712.90

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Solution

The fourth proportional to 143,876.10, 215,814.15 and 128,712.90 is: 193,069.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,876.10 : 215,814.15 = 128,712.90 : x
  2. Step 2: Convert to fraction form
    143,876.10/215,814.15 = 128,712.90/x
  3. Step 3: Cross multiply
    143,876.10x = 215,814.15 × 128,712.90
  4. Step 4: Simplify right side
    143,876.10x = 27,778,065,107.54
  5. Step 5: Solve for x
    x = 27,778,065,107.54/143,876.10
  6. Step 6: Final answer
    x = 193,069.35

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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.