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Finding the Fourth Proportional to 3,587.64, 5,381.46 and 990.78

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Solution

The fourth proportional to 3,587.64, 5,381.46 and 990.78 is: 1,486.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,587.64 : 5,381.46 = 990.78 : x
  2. Step 2: Convert to fraction form
    3,587.64/5,381.46 = 990.78/x
  3. Step 3: Cross multiply
    3,587.64x = 5,381.46 × 990.78
  4. Step 4: Simplify right side
    3,587.64x = 5,331,842.94
  5. Step 5: Solve for x
    x = 5,331,842.94/3,587.64
  6. Step 6: Final answer
    x = 1,486.17

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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.