Home / 1,091.40-1,637.10-921.30

Finding the Fourth Proportional to 1,091.40, 1,637.10 and 921.30

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Solution

The fourth proportional to 1,091.40, 1,637.10 and 921.30 is: 1,381.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.40 : 1,637.10 = 921.30 : x
  2. Step 2: Convert to fraction form
    1,091.40/1,637.10 = 921.30/x
  3. Step 3: Cross multiply
    1,091.40x = 1,637.10 × 921.30
  4. Step 4: Simplify right side
    1,091.40x = 1,508,260.23
  5. Step 5: Solve for x
    x = 1,508,260.23/1,091.40
  6. Step 6: Final answer
    x = 1,381.95

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Double scale
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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.