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Finding the Fourth Proportional to 713.64, 1,068.30 and 653.88

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Solution

The fourth proportional to 713.64, 1,068.30 and 653.88 is: 978.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.64 : 1,068.30 = 653.88 : x
  2. Step 2: Convert to fraction form
    713.64/1,068.30 = 653.88/x
  3. Step 3: Cross multiply
    713.64x = 1,068.30 × 653.88
  4. Step 4: Simplify right side
    713.64x = 698,540.00
  5. Step 5: Solve for x
    x = 698,540.00/713.64
  6. Step 6: Final answer
    x = 978.84

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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.