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Finding the Fourth Proportional to 283,389.78, 391,081.59 and 156,074.79

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Solution

The fourth proportional to 283,389.78, 391,081.59 and 156,074.79 is: 215,385.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    283,389.78 : 391,081.59 = 156,074.79 : x
  2. Step 2: Convert to fraction form
    283,389.78/391,081.59 = 156,074.79/x
  3. Step 3: Cross multiply
    283,389.78x = 391,081.59 × 156,074.79
  4. Step 4: Simplify right side
    283,389.78x = 61,037,977,032.12
  5. Step 5: Solve for x
    x = 61,037,977,032.12/283,389.78
  6. Step 6: Final answer
    x = 215,385.24

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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.