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Finding the Fourth Proportional to 283,640.80, 391,426.68 and 156,316.72

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Solution

The fourth proportional to 283,640.80, 391,426.68 and 156,316.72 is: 215,718.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    283,640.80 : 391,426.68 = 156,316.72 : x
  2. Step 2: Convert to fraction form
    283,640.80/391,426.68 = 156,316.72/x
  3. Step 3: Cross multiply
    283,640.80x = 391,426.68 × 156,316.72
  4. Step 4: Simplify right side
    283,640.80x = 61,186,534,738.09
  5. Step 5: Solve for x
    x = 61,186,534,738.09/283,640.80
  6. Step 6: Final answer
    x = 215,718.38

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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.