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Finding the Fourth Proportional to 1,086.10, 1,625.55 and 999.70

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Solution

The fourth proportional to 1,086.10, 1,625.55 and 999.70 is: 1,496.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,086.10 : 1,625.55 = 999.70 : x
  2. Step 2: Convert to fraction form
    1,086.10/1,625.55 = 999.70/x
  3. Step 3: Cross multiply
    1,086.10x = 1,625.55 × 999.70
  4. Step 4: Simplify right side
    1,086.10x = 1,625,062.34
  5. Step 5: Solve for x
    x = 1,625,062.34/1,086.10
  6. Step 6: Final answer
    x = 1,496.24

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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.