Home / 138,708.21-191,417.26-78,291.53

Finding the Fourth Proportional to 138,708.21, 191,417.26 and 78,291.53

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Solution

The fourth proportional to 138,708.21, 191,417.26 and 78,291.53 is: 108,042.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,708.21 : 191,417.26 = 78,291.53 : x
  2. Step 2: Convert to fraction form
    138,708.21/191,417.26 = 78,291.53/x
  3. Step 3: Cross multiply
    138,708.21x = 191,417.26 × 78,291.53
  4. Step 4: Simplify right side
    138,708.21x = 14,986,350,153.81
  5. Step 5: Solve for x
    x = 14,986,350,153.81/138,708.21
  6. Step 6: Final answer
    x = 108,042.27

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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.