Home / 100,347.39-138,376.04-70,121.70

Finding the Fourth Proportional to 100,347.39, 138,376.04 and 70,121.70

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Solution

The fourth proportional to 100,347.39, 138,376.04 and 70,121.70 is: 96,695.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,347.39 : 138,376.04 = 70,121.70 : x
  2. Step 2: Convert to fraction form
    100,347.39/138,376.04 = 70,121.70/x
  3. Step 3: Cross multiply
    100,347.39x = 138,376.04 × 70,121.70
  4. Step 4: Simplify right side
    100,347.39x = 9,703,162,813.46
  5. Step 5: Solve for x
    x = 9,703,162,813.46/100,347.39
  6. Step 6: Final answer
    x = 96,695.72

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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.