Home / 100,123.56-138,023.28-76,208.58

Finding the Fourth Proportional to 100,123.56, 138,023.28 and 76,208.58

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Solution

The fourth proportional to 100,123.56, 138,023.28 and 76,208.58 is: 105,055.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,123.56 : 138,023.28 = 76,208.58 : x
  2. Step 2: Convert to fraction form
    100,123.56/138,023.28 = 76,208.58/x
  3. Step 3: Cross multiply
    100,123.56x = 138,023.28 × 76,208.58
  4. Step 4: Simplify right side
    100,123.56x = 10,518,558,175.74
  5. Step 5: Solve for x
    x = 10,518,558,175.74/100,123.56
  6. Step 6: Final answer
    x = 105,055.77

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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.