Home / 138,789.64-191,538.56-78,338.23

Finding the Fourth Proportional to 138,789.64, 191,538.56 and 78,338.23

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Solution

The fourth proportional to 138,789.64, 191,538.56 and 78,338.23 is: 108,111.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,789.64 : 191,538.56 = 78,338.23 : x
  2. Step 2: Convert to fraction form
    138,789.64/191,538.56 = 78,338.23/x
  3. Step 3: Cross multiply
    138,789.64x = 191,538.56 × 78,338.23
  4. Step 4: Simplify right side
    138,789.64x = 15,004,790,417.76
  5. Step 5: Solve for x
    x = 15,004,790,417.76/138,789.64
  6. Step 6: Final answer
    x = 108,111.75

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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.