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Finding the Fourth Proportional to 663,312.40, 915,371.98 and 361,506.40

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Solution

The fourth proportional to 663,312.40, 915,371.98 and 361,506.40 is: 498,879.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,312.40 : 915,371.98 = 361,506.40 : x
  2. Step 2: Convert to fraction form
    663,312.40/915,371.98 = 361,506.40/x
  3. Step 3: Cross multiply
    663,312.40x = 915,371.98 × 361,506.40
  4. Step 4: Simplify right side
    663,312.40x = 330,912,829,150.67
  5. Step 5: Solve for x
    x = 330,912,829,150.67/663,312.40
  6. Step 6: Final answer
    x = 498,879.31

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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.