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Finding the Fourth Proportional to 389,686.80, 584,530.20 and 127,030.80

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Solution

The fourth proportional to 389,686.80, 584,530.20 and 127,030.80 is: 190,546.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,686.80 : 584,530.20 = 127,030.80 : x
  2. Step 2: Convert to fraction form
    389,686.80/584,530.20 = 127,030.80/x
  3. Step 3: Cross multiply
    389,686.80x = 584,530.20 × 127,030.80
  4. Step 4: Simplify right side
    389,686.80x = 74,253,338,930.16
  5. Step 5: Solve for x
    x = 74,253,338,930.16/389,686.80
  6. Step 6: Final answer
    x = 190,546.20

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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.