Home / 100,013.28-138,018.38-56,991.56

Finding the Fourth Proportional to 100,013.28, 138,018.38 and 56,991.56

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Solution

The fourth proportional to 100,013.28, 138,018.38 and 56,991.56 is: 78,648.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,013.28 : 138,018.38 = 56,991.56 : x
  2. Step 2: Convert to fraction form
    100,013.28/138,018.38 = 56,991.56/x
  3. Step 3: Cross multiply
    100,013.28x = 138,018.38 × 56,991.56
  4. Step 4: Simplify right side
    100,013.28x = 7,865,881,809.82
  5. Step 5: Solve for x
    x = 7,865,881,809.82/100,013.28
  6. Step 6: Final answer
    x = 78,648.37

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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.