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Finding the Fourth Proportional to 712.53, 1,068.80 and 693.09

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Solution

The fourth proportional to 712.53, 1,068.80 and 693.09 is: 1,039.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.53 : 1,068.80 = 693.09 : x
  2. Step 2: Convert to fraction form
    712.53/1,068.80 = 693.09/x
  3. Step 3: Cross multiply
    712.53x = 1,068.80 × 693.09
  4. Step 4: Simplify right side
    712.53x = 740,771.13
  5. Step 5: Solve for x
    x = 740,771.13/712.53
  6. Step 6: Final answer
    x = 1,039.64

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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.