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Finding the Fourth Proportional to 108,521.80, 162,782.70 and 61,865.80

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Solution

The fourth proportional to 108,521.80, 162,782.70 and 61,865.80 is: 92,798.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,521.80 : 162,782.70 = 61,865.80 : x
  2. Step 2: Convert to fraction form
    108,521.80/162,782.70 = 61,865.80/x
  3. Step 3: Cross multiply
    108,521.80x = 162,782.70 × 61,865.80
  4. Step 4: Simplify right side
    108,521.80x = 10,070,681,961.66
  5. Step 5: Solve for x
    x = 10,070,681,961.66/108,521.80
  6. Step 6: Final answer
    x = 92,798.70

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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.