Home / 1,645.20-2,270.70-981.72

Finding the Fourth Proportional to 1,645.20, 2,270.70 and 981.72

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Solution

The fourth proportional to 1,645.20, 2,270.70 and 981.72 is: 1,354.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,645.20 : 2,270.70 = 981.72 : x
  2. Step 2: Convert to fraction form
    1,645.20/2,270.70 = 981.72/x
  3. Step 3: Cross multiply
    1,645.20x = 2,270.70 × 981.72
  4. Step 4: Simplify right side
    1,645.20x = 2,229,191.60
  5. Step 5: Solve for x
    x = 2,229,191.60/1,645.20
  6. Step 6: Final answer
    x = 1,354.97

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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.