Home / 1,587.38-2,191.41-990.07

Finding the Fourth Proportional to 1,587.38, 2,191.41 and 990.07

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Solution

The fourth proportional to 1,587.38, 2,191.41 and 990.07 is: 1,366.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,587.38 : 2,191.41 = 990.07 : x
  2. Step 2: Convert to fraction form
    1,587.38/2,191.41 = 990.07/x
  3. Step 3: Cross multiply
    1,587.38x = 2,191.41 × 990.07
  4. Step 4: Simplify right side
    1,587.38x = 2,169,643.82
  5. Step 5: Solve for x
    x = 2,169,643.82/1,587.38
  6. Step 6: Final answer
    x = 1,366.81

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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.