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Finding the Fourth Proportional to 663,838.40, 915,372.32 and 448,605.12

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Solution

The fourth proportional to 663,838.40, 915,372.32 and 448,605.12 is: 618,585.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,838.40 : 915,372.32 = 448,605.12 : x
  2. Step 2: Convert to fraction form
    663,838.40/915,372.32 = 448,605.12/x
  3. Step 3: Cross multiply
    663,838.40x = 915,372.32 × 448,605.12
  4. Step 4: Simplify right side
    663,838.40x = 410,640,709,458.28
  5. Step 5: Solve for x
    x = 410,640,709,458.28/663,838.40
  6. Step 6: Final answer
    x = 618,585.35

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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.