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Finding the Fourth Proportional to 156,339.79, 215,747.49 and 84,720.40

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Solution

The fourth proportional to 156,339.79, 215,747.49 and 84,720.40 is: 116,913.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,339.79 : 215,747.49 = 84,720.40 : x
  2. Step 2: Convert to fraction form
    156,339.79/215,747.49 = 84,720.40/x
  3. Step 3: Cross multiply
    156,339.79x = 215,747.49 × 84,720.40
  4. Step 4: Simplify right side
    156,339.79x = 18,278,213,651.80
  5. Step 5: Solve for x
    x = 18,278,213,651.80/156,339.79
  6. Step 6: Final answer
    x = 116,913.38

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1.5x scale

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.