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Finding the Fourth Proportional to 391,938.60, 588,005.10 and 111,455.40

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Solution

The fourth proportional to 391,938.60, 588,005.10 and 111,455.40 is: 167,210.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,938.60 : 588,005.10 = 111,455.40 : x
  2. Step 2: Convert to fraction form
    391,938.60/588,005.10 = 111,455.40/x
  3. Step 3: Cross multiply
    391,938.60x = 588,005.10 × 111,455.40
  4. Step 4: Simplify right side
    391,938.60x = 65,536,343,622.54
  5. Step 5: Solve for x
    x = 65,536,343,622.54/391,938.60
  6. Step 6: Final answer
    x = 167,210.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.