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Finding the Fourth Proportional to 1,187.25, 1,779.69 and 570.78

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Solution

The fourth proportional to 1,187.25, 1,779.69 and 570.78 is: 855.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.25 : 1,779.69 = 570.78 : x
  2. Step 2: Convert to fraction form
    1,187.25/1,779.69 = 570.78/x
  3. Step 3: Cross multiply
    1,187.25x = 1,779.69 × 570.78
  4. Step 4: Simplify right side
    1,187.25x = 1,015,811.46
  5. Step 5: Solve for x
    x = 1,015,811.46/1,187.25
  6. Step 6: Final answer
    x = 855.60

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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.