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Finding the Fourth Proportional to 391,628.40, 587,442.60 and 96,140.40

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Solution

The fourth proportional to 391,628.40, 587,442.60 and 96,140.40 is: 144,210.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,628.40 : 587,442.60 = 96,140.40 : x
  2. Step 2: Convert to fraction form
    391,628.40/587,442.60 = 96,140.40/x
  3. Step 3: Cross multiply
    391,628.40x = 587,442.60 × 96,140.40
  4. Step 4: Simplify right side
    391,628.40x = 56,476,966,541.04
  5. Step 5: Solve for x
    x = 56,476,966,541.04/391,628.40
  6. Step 6: Final answer
    x = 144,210.60

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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.