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Finding the Fourth Proportional to 1,187.34, 1,779.45 and 859.38

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Solution

The fourth proportional to 1,187.34, 1,779.45 and 859.38 is: 1,287.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.34 : 1,779.45 = 859.38 : x
  2. Step 2: Convert to fraction form
    1,187.34/1,779.45 = 859.38/x
  3. Step 3: Cross multiply
    1,187.34x = 1,779.45 × 859.38
  4. Step 4: Simplify right side
    1,187.34x = 1,529,223.74
  5. Step 5: Solve for x
    x = 1,529,223.74/1,187.34
  6. Step 6: Final answer
    x = 1,287.95

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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.