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Finding the Fourth Proportional to 1,303.79, 1,799.60 and 861.80

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Solution

The fourth proportional to 1,303.79, 1,799.60 and 861.80 is: 1,189.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,303.79 : 1,799.60 = 861.80 : x
  2. Step 2: Convert to fraction form
    1,303.79/1,799.60 = 861.80/x
  3. Step 3: Cross multiply
    1,303.79x = 1,799.60 × 861.80
  4. Step 4: Simplify right side
    1,303.79x = 1,550,881.97
  5. Step 5: Solve for x
    x = 1,550,881.97/1,303.79
  6. Step 6: Final answer
    x = 1,189.52

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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.