Home / 138,142.07-190,635.78-77,712.76

Finding the Fourth Proportional to 138,142.07, 190,635.78 and 77,712.76

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Solution

The fourth proportional to 138,142.07, 190,635.78 and 77,712.76 is: 107,243.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,142.07 : 190,635.78 = 77,712.76 : x
  2. Step 2: Convert to fraction form
    138,142.07/190,635.78 = 77,712.76/x
  3. Step 3: Cross multiply
    138,142.07x = 190,635.78 × 77,712.76
  4. Step 4: Simplify right side
    138,142.07x = 14,814,832,618.55
  5. Step 5: Solve for x
    x = 14,814,832,618.55/138,142.07
  6. Step 6: Final answer
    x = 107,243.45

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1.5x scale

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.