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Finding the Fourth Proportional to 156,321.90, 215,722.80 and 84,701.70

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Solution

The fourth proportional to 156,321.90, 215,722.80 and 84,701.70 is: 116,887.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,321.90 : 215,722.80 = 84,701.70 : x
  2. Step 2: Convert to fraction form
    156,321.90/215,722.80 = 84,701.70/x
  3. Step 3: Cross multiply
    156,321.90x = 215,722.80 × 84,701.70
  4. Step 4: Simplify right side
    156,321.90x = 18,272,087,888.76
  5. Step 5: Solve for x
    x = 18,272,087,888.76/156,321.90
  6. Step 6: Final answer
    x = 116,887.58

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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.