Home / 78,145.13-116,531.33-77,434.65

Finding the Fourth Proportional to 78,145.13, 116,531.33 and 77,434.65

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Solution

The fourth proportional to 78,145.13, 116,531.33 and 77,434.65 is: 115,471.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,145.13 : 116,531.33 = 77,434.65 : x
  2. Step 2: Convert to fraction form
    78,145.13/116,531.33 = 77,434.65/x
  3. Step 3: Cross multiply
    78,145.13x = 116,531.33 × 77,434.65
  4. Step 4: Simplify right side
    78,145.13x = 9,023,562,365.41
  5. Step 5: Solve for x
    x = 9,023,562,365.41/78,145.13
  6. Step 6: Final answer
    x = 115,471.85

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.