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Finding the Fourth Proportional to 1,036.50, 1,561.88 and 857.90

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Solution

The fourth proportional to 1,036.50, 1,561.88 and 857.90 is: 1,292.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,036.50 : 1,561.88 = 857.90 : x
  2. Step 2: Convert to fraction form
    1,036.50/1,561.88 = 857.90/x
  3. Step 3: Cross multiply
    1,036.50x = 1,561.88 × 857.90
  4. Step 4: Simplify right side
    1,036.50x = 1,339,936.85
  5. Step 5: Solve for x
    x = 1,339,936.85/1,036.50
  6. Step 6: Final answer
    x = 1,292.75

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.