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Finding the Fourth Proportional to 398,987, 550,602.06 and 220,139

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Solution

The fourth proportional to 398,987, 550,602.06 and 220,139 is: 303,791.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,987 : 550,602.06 = 220,139 : x
  2. Step 2: Convert to fraction form
    398,987/550,602.06 = 220,139/x
  3. Step 3: Cross multiply
    398,987x = 550,602.06 × 220,139
  4. Step 4: Simplify right side
    398,987x = 121,208,986,886.34
  5. Step 5: Solve for x
    x = 121,208,986,886.34/398,987
  6. Step 6: Final answer
    x = 303,791.82

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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.