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Finding the Fourth Proportional to 2,938.68, 4,408.65 and 990.86

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Solution

The fourth proportional to 2,938.68, 4,408.65 and 990.86 is: 1,486.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,938.68 : 4,408.65 = 990.86 : x
  2. Step 2: Convert to fraction form
    2,938.68/4,408.65 = 990.86/x
  3. Step 3: Cross multiply
    2,938.68x = 4,408.65 × 990.86
  4. Step 4: Simplify right side
    2,938.68x = 4,368,332.90
  5. Step 5: Solve for x
    x = 4,368,332.90/2,938.68
  6. Step 6: Final answer
    x = 1,486.49

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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.