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Finding the Fourth Proportional to 657,962.40, 987,404.40 and 421,879.20

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Solution

The fourth proportional to 657,962.40, 987,404.40 and 421,879.20 is: 633,114.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    657,962.40 : 987,404.40 = 421,879.20 : x
  2. Step 2: Convert to fraction form
    657,962.40/987,404.40 = 421,879.20/x
  3. Step 3: Cross multiply
    657,962.40x = 987,404.40 × 421,879.20
  4. Step 4: Simplify right side
    657,962.40x = 416,565,378,348.48
  5. Step 5: Solve for x
    x = 416,565,378,348.48/657,962.40
  6. Step 6: Final answer
    x = 633,114.26

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1.5x scale

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.