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Finding the Fourth Proportional to 386,686.80, 580,030.20 and 360,442.80

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Solution

The fourth proportional to 386,686.80, 580,030.20 and 360,442.80 is: 540,664.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,686.80 : 580,030.20 = 360,442.80 : x
  2. Step 2: Convert to fraction form
    386,686.80/580,030.20 = 360,442.80/x
  3. Step 3: Cross multiply
    386,686.80x = 580,030.20 × 360,442.80
  4. Step 4: Simplify right side
    386,686.80x = 209,067,709,372.56
  5. Step 5: Solve for x
    x = 209,067,709,372.56/386,686.80
  6. Step 6: Final answer
    x = 540,664.20

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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.