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Finding the Fourth Proportional to 1,077.12, 1,615.68 and 859.68

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Solution

The fourth proportional to 1,077.12, 1,615.68 and 859.68 is: 1,289.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,077.12 : 1,615.68 = 859.68 : x
  2. Step 2: Convert to fraction form
    1,077.12/1,615.68 = 859.68/x
  3. Step 3: Cross multiply
    1,077.12x = 1,615.68 × 859.68
  4. Step 4: Simplify right side
    1,077.12x = 1,388,967.78
  5. Step 5: Solve for x
    x = 1,388,967.78/1,077.12
  6. Step 6: Final answer
    x = 1,289.52

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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.