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Finding the Fourth Proportional to 1,089.14, 1,631.88 and 859.52

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Solution

The fourth proportional to 1,089.14, 1,631.88 and 859.52 is: 1,287.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.14 : 1,631.88 = 859.52 : x
  2. Step 2: Convert to fraction form
    1,089.14/1,631.88 = 859.52/x
  3. Step 3: Cross multiply
    1,089.14x = 1,631.88 × 859.52
  4. Step 4: Simplify right side
    1,089.14x = 1,402,633.50
  5. Step 5: Solve for x
    x = 1,402,633.50/1,089.14
  6. Step 6: Final answer
    x = 1,287.84

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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.