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Finding the Fourth Proportional to 859.12, 1,287.78 and 653.26

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Solution

The fourth proportional to 859.12, 1,287.78 and 653.26 is: 979.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.12 : 1,287.78 = 653.26 : x
  2. Step 2: Convert to fraction form
    859.12/1,287.78 = 653.26/x
  3. Step 3: Cross multiply
    859.12x = 1,287.78 × 653.26
  4. Step 4: Simplify right side
    859.12x = 841,250.36
  5. Step 5: Solve for x
    x = 841,250.36/859.12
  6. Step 6: Final answer
    x = 979.20

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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.