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Finding the Fourth Proportional to 1,311.75, 1,810.96 and 870.25

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Solution

The fourth proportional to 1,311.75, 1,810.96 and 870.25 is: 1,201.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.75 : 1,810.96 = 870.25 : x
  2. Step 2: Convert to fraction form
    1,311.75/1,810.96 = 870.25/x
  3. Step 3: Cross multiply
    1,311.75x = 1,810.96 × 870.25
  4. Step 4: Simplify right side
    1,311.75x = 1,575,987.94
  5. Step 5: Solve for x
    x = 1,575,987.94/1,311.75
  6. Step 6: Final answer
    x = 1,201.44

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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.