Home / 312,347.10-431,765.37-278,689.17

Finding the Fourth Proportional to 312,347.10, 431,765.37 and 278,689.17

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Solution

The fourth proportional to 312,347.10, 431,765.37 and 278,689.17 is: 385,239.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,347.10 : 431,765.37 = 278,689.17 : x
  2. Step 2: Convert to fraction form
    312,347.10/431,765.37 = 278,689.17/x
  3. Step 3: Cross multiply
    312,347.10x = 431,765.37 × 278,689.17
  4. Step 4: Simplify right side
    312,347.10x = 120,328,332,600.04
  5. Step 5: Solve for x
    x = 120,328,332,600.04/312,347.10
  6. Step 6: Final answer
    x = 385,239.15

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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.