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Finding the Fourth Proportional to 1,577.86, 2,177.82 and 980.70

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Solution

The fourth proportional to 1,577.86, 2,177.82 and 980.70 is: 1,353.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,577.86 : 2,177.82 = 980.70 : x
  2. Step 2: Convert to fraction form
    1,577.86/2,177.82 = 980.70/x
  3. Step 3: Cross multiply
    1,577.86x = 2,177.82 × 980.70
  4. Step 4: Simplify right side
    1,577.86x = 2,135,788.07
  5. Step 5: Solve for x
    x = 2,135,788.07/1,577.86
  6. Step 6: Final answer
    x = 1,353.60

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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.