Home / 138,428.85-190,619.67-128,381.49

Finding the Fourth Proportional to 138,428.85, 190,619.67 and 128,381.49

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Solution

The fourth proportional to 138,428.85, 190,619.67 and 128,381.49 is: 176,784.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,428.85 : 190,619.67 = 128,381.49 : x
  2. Step 2: Convert to fraction form
    138,428.85/190,619.67 = 128,381.49/x
  3. Step 3: Cross multiply
    138,428.85x = 190,619.67 × 128,381.49
  4. Step 4: Simplify right side
    138,428.85x = 24,472,037,257.91
  5. Step 5: Solve for x
    x = 24,472,037,257.91/138,428.85
  6. Step 6: Final answer
    x = 176,784.23

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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.