Home / 1,187.13-1,779.77-724.83

Finding the Fourth Proportional to 1,187.13, 1,779.77 and 724.83

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Solution

The fourth proportional to 1,187.13, 1,779.77 and 724.83 is: 1,086.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.13 : 1,779.77 = 724.83 : x
  2. Step 2: Convert to fraction form
    1,187.13/1,779.77 = 724.83/x
  3. Step 3: Cross multiply
    1,187.13x = 1,779.77 × 724.83
  4. Step 4: Simplify right side
    1,187.13x = 1,290,030.69
  5. Step 5: Solve for x
    x = 1,290,030.69/1,187.13
  6. Step 6: Final answer
    x = 1,086.68

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1.5x scale

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.