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Finding the Fourth Proportional to 283,385, 391,065.36 and 156,061.64

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Solution

The fourth proportional to 283,385, 391,065.36 and 156,061.64 is: 215,361.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    283,385 : 391,065.36 = 156,061.64 : x
  2. Step 2: Convert to fraction form
    283,385/391,065.36 = 156,061.64/x
  3. Step 3: Cross multiply
    283,385x = 391,065.36 × 156,061.64
  4. Step 4: Simplify right side
    283,385x = 61,030,301,428.79
  5. Step 5: Solve for x
    x = 61,030,301,428.79/283,385
  6. Step 6: Final answer
    x = 215,361.79

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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.