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Finding the Fourth Proportional to 156,781.98, 216,360.73 and 85,163.40

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Solution

The fourth proportional to 156,781.98, 216,360.73 and 85,163.40 is: 117,526.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,781.98 : 216,360.73 = 85,163.40 : x
  2. Step 2: Convert to fraction form
    156,781.98/216,360.73 = 85,163.40/x
  3. Step 3: Cross multiply
    156,781.98x = 216,360.73 × 85,163.40
  4. Step 4: Simplify right side
    156,781.98x = 18,426,015,393.28
  5. Step 5: Solve for x
    x = 18,426,015,393.28/156,781.98
  6. Step 6: Final answer
    x = 117,526.36

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.