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Finding the Fourth Proportional to 663,311.40, 915,370.60 and 361,505.40

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Solution

The fourth proportional to 663,311.40, 915,370.60 and 361,505.40 is: 498,877.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,311.40 : 915,370.60 = 361,505.40 : x
  2. Step 2: Convert to fraction form
    663,311.40/915,370.60 = 361,505.40/x
  3. Step 3: Cross multiply
    663,311.40x = 915,370.60 × 361,505.40
  4. Step 4: Simplify right side
    663,311.40x = 330,911,414,901.24
  5. Step 5: Solve for x
    x = 330,911,414,901.24/663,311.40
  6. Step 6: Final answer
    x = 498,877.93

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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.