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Finding the Fourth Proportional to 657,846.40, 987,230.40 and 421,763.20

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Solution

The fourth proportional to 657,846.40, 987,230.40 and 421,763.20 is: 632,940.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    657,846.40 : 987,230.40 = 421,763.20 : x
  2. Step 2: Convert to fraction form
    657,846.40/987,230.40 = 421,763.20/x
  3. Step 3: Cross multiply
    657,846.40x = 987,230.40 × 421,763.20
  4. Step 4: Simplify right side
    657,846.40x = 416,377,452,641.28
  5. Step 5: Solve for x
    x = 416,377,452,641.28/657,846.40
  6. Step 6: Final answer
    x = 632,940.23

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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.