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Finding the Fourth Proportional to 143,417.40, 215,053.20 and 84,271.20

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Solution

The fourth proportional to 143,417.40, 215,053.20 and 84,271.20 is: 126,363.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,417.40 : 215,053.20 = 84,271.20 : x
  2. Step 2: Convert to fraction form
    143,417.40/215,053.20 = 84,271.20/x
  3. Step 3: Cross multiply
    143,417.40x = 215,053.20 × 84,271.20
  4. Step 4: Simplify right side
    143,417.40x = 18,122,791,227.84
  5. Step 5: Solve for x
    x = 18,122,791,227.84/143,417.40
  6. Step 6: Final answer
    x = 126,363.96

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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.