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Finding the Fourth Proportional to 3,587.44, 5,381.32 and 990.32

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Solution

The fourth proportional to 3,587.44, 5,381.32 and 990.32 is: 1,485.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,587.44 : 5,381.32 = 990.32 : x
  2. Step 2: Convert to fraction form
    3,587.44/5,381.32 = 990.32/x
  3. Step 3: Cross multiply
    3,587.44x = 5,381.32 × 990.32
  4. Step 4: Simplify right side
    3,587.44x = 5,329,228.82
  5. Step 5: Solve for x
    x = 5,329,228.82/3,587.44
  6. Step 6: Final answer
    x = 1,485.52

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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.