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Finding the Fourth Proportional to 3,587.87, 5,382.12 and 990.81

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Solution

The fourth proportional to 3,587.87, 5,382.12 and 990.81 is: 1,486.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,587.87 : 5,382.12 = 990.81 : x
  2. Step 2: Convert to fraction form
    3,587.87/5,382.12 = 990.81/x
  3. Step 3: Cross multiply
    3,587.87x = 5,382.12 × 990.81
  4. Step 4: Simplify right side
    3,587.87x = 5,332,656.46
  5. Step 5: Solve for x
    x = 5,332,656.46/3,587.87
  6. Step 6: Final answer
    x = 1,486.30

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1.5x scale

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.