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Finding the Fourth Proportional to 1,008.75, 1,392.09 and 615.72

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Solution

The fourth proportional to 1,008.75, 1,392.09 and 615.72 is: 849.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.75 : 1,392.09 = 615.72 : x
  2. Step 2: Convert to fraction form
    1,008.75/1,392.09 = 615.72/x
  3. Step 3: Cross multiply
    1,008.75x = 1,392.09 × 615.72
  4. Step 4: Simplify right side
    1,008.75x = 857,137.65
  5. Step 5: Solve for x
    x = 857,137.65/1,008.75
  6. Step 6: Final answer
    x = 849.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.