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Finding the Fourth Proportional to 1,209.28, 1,668 and 860.16

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Solution

The fourth proportional to 1,209.28, 1,668 and 860.16 is: 1,186.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.28 : 1,668 = 860.16 : x
  2. Step 2: Convert to fraction form
    1,209.28/1,668 = 860.16/x
  3. Step 3: Cross multiply
    1,209.28x = 1,668 × 860.16
  4. Step 4: Simplify right side
    1,209.28x = 1,434,746.88
  5. Step 5: Solve for x
    x = 1,434,746.88/1,209.28
  6. Step 6: Final answer
    x = 1,186.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.