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Finding the Fourth Proportional to 100,378.39, 138,526.05 and 55,058.28

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Solution

The fourth proportional to 100,378.39, 138,526.05 and 55,058.28 is: 75,982.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,378.39 : 138,526.05 = 55,058.28 : x
  2. Step 2: Convert to fraction form
    100,378.39/138,526.05 = 55,058.28/x
  3. Step 3: Cross multiply
    100,378.39x = 138,526.05 × 55,058.28
  4. Step 4: Simplify right side
    100,378.39x = 7,627,006,048.19
  5. Step 5: Solve for x
    x = 7,627,006,048.19/100,378.39
  6. Step 6: Final answer
    x = 75,982.55

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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.