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Finding the Fourth Proportional to 1,002.98, 1,502.08 and 855.90

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Solution

The fourth proportional to 1,002.98, 1,502.08 and 855.90 is: 1,281.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,002.98 : 1,502.08 = 855.90 : x
  2. Step 2: Convert to fraction form
    1,002.98/1,502.08 = 855.90/x
  3. Step 3: Cross multiply
    1,002.98x = 1,502.08 × 855.90
  4. Step 4: Simplify right side
    1,002.98x = 1,285,628.13
  5. Step 5: Solve for x
    x = 1,285,628.13/1,002.98
  6. Step 6: Final answer
    x = 1,281.81

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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.