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Finding the Fourth Proportional to 1,578.03, 2,177.60 and 980.39

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Solution

The fourth proportional to 1,578.03, 2,177.60 and 980.39 is: 1,352.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,578.03 : 2,177.60 = 980.39 : x
  2. Step 2: Convert to fraction form
    1,578.03/2,177.60 = 980.39/x
  3. Step 3: Cross multiply
    1,578.03x = 2,177.60 × 980.39
  4. Step 4: Simplify right side
    1,578.03x = 2,134,881.47
  5. Step 5: Solve for x
    x = 2,134,881.47/1,578.03
  6. Step 6: Final answer
    x = 1,352.88

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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.