Home / 138,128.47-190,643.45-86,469.61

Finding the Fourth Proportional to 138,128.47, 190,643.45 and 86,469.61

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Solution

The fourth proportional to 138,128.47, 190,643.45 and 86,469.61 is: 119,344.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,128.47 : 190,643.45 = 86,469.61 : x
  2. Step 2: Convert to fraction form
    138,128.47/190,643.45 = 86,469.61/x
  3. Step 3: Cross multiply
    138,128.47x = 190,643.45 × 86,469.61
  4. Step 4: Simplify right side
    138,128.47x = 16,484,865,266.53
  5. Step 5: Solve for x
    x = 16,484,865,266.53/138,128.47
  6. Step 6: Final answer
    x = 119,344.44

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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.