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Finding the Fourth Proportional to 398,988, 550,603.44 and 220,140

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Solution

The fourth proportional to 398,988, 550,603.44 and 220,140 is: 303,793.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,988 : 550,603.44 = 220,140 : x
  2. Step 2: Convert to fraction form
    398,988/550,603.44 = 220,140/x
  3. Step 3: Cross multiply
    398,988x = 550,603.44 × 220,140
  4. Step 4: Simplify right side
    398,988x = 121,209,841,281.60
  5. Step 5: Solve for x
    x = 121,209,841,281.60/398,988
  6. Step 6: Final answer
    x = 303,793.20

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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.