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Finding the Fourth Proportional to 2,938.32, 4,407.90 and 991.08

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Solution

The fourth proportional to 2,938.32, 4,407.90 and 991.08 is: 1,486.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,938.32 : 4,407.90 = 991.08 : x
  2. Step 2: Convert to fraction form
    2,938.32/4,407.90 = 991.08/x
  3. Step 3: Cross multiply
    2,938.32x = 4,407.90 × 991.08
  4. Step 4: Simplify right side
    2,938.32x = 4,368,581.53
  5. Step 5: Solve for x
    x = 4,368,581.53/2,938.32
  6. Step 6: Final answer
    x = 1,486.76

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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.