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Finding the Fourth Proportional to 156,315.30, 215,715.30 and 84,695.31

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Solution

The fourth proportional to 156,315.30, 215,715.30 and 84,695.31 is: 116,879.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,315.30 : 215,715.30 = 84,695.31 : x
  2. Step 2: Convert to fraction form
    156,315.30/215,715.30 = 84,695.31/x
  3. Step 3: Cross multiply
    156,315.30x = 215,715.30 × 84,695.31
  4. Step 4: Simplify right side
    156,315.30x = 18,270,074,205.24
  5. Step 5: Solve for x
    x = 18,270,074,205.24/156,315.30
  6. Step 6: Final answer
    x = 116,879.63

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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.