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Finding the Fourth Proportional to 3,290.78, 4,931.84 and 1,559.90

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Solution

The fourth proportional to 3,290.78, 4,931.84 and 1,559.90 is: 2,337.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,290.78 : 4,931.84 = 1,559.90 : x
  2. Step 2: Convert to fraction form
    3,290.78/4,931.84 = 1,559.90/x
  3. Step 3: Cross multiply
    3,290.78x = 4,931.84 × 1,559.90
  4. Step 4: Simplify right side
    3,290.78x = 7,693,177.22
  5. Step 5: Solve for x
    x = 7,693,177.22/3,290.78
  6. Step 6: Final answer
    x = 2,337.80

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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.