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Finding the Fourth Proportional to 1,303.80, 1,799.53 and 861.74

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Solution

The fourth proportional to 1,303.80, 1,799.53 and 861.74 is: 1,189.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,303.80 : 1,799.53 = 861.74 : x
  2. Step 2: Convert to fraction form
    1,303.80/1,799.53 = 861.74/x
  3. Step 3: Cross multiply
    1,303.80x = 1,799.53 × 861.74
  4. Step 4: Simplify right side
    1,303.80x = 1,550,729.33
  5. Step 5: Solve for x
    x = 1,550,729.33/1,303.80
  6. Step 6: Final answer
    x = 1,189.39

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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.