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Finding the Fourth Proportional to 108,491.40, 162,712.80 and 71,312.40

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Solution

The fourth proportional to 108,491.40, 162,712.80 and 71,312.40 is: 106,952.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,491.40 : 162,712.80 = 71,312.40 : x
  2. Step 2: Convert to fraction form
    108,491.40/162,712.80 = 71,312.40/x
  3. Step 3: Cross multiply
    108,491.40x = 162,712.80 × 71,312.40
  4. Step 4: Simplify right side
    108,491.40x = 11,603,440,278.72
  5. Step 5: Solve for x
    x = 11,603,440,278.72/108,491.40
  6. Step 6: Final answer
    x = 106,952.63

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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.