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Finding the Fourth Proportional to 718.44, 1,072.05 and 690.36

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Solution

The fourth proportional to 718.44, 1,072.05 and 690.36 is: 1,030.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.44 : 1,072.05 = 690.36 : x
  2. Step 2: Convert to fraction form
    718.44/1,072.05 = 690.36/x
  3. Step 3: Cross multiply
    718.44x = 1,072.05 × 690.36
  4. Step 4: Simplify right side
    718.44x = 740,100.44
  5. Step 5: Solve for x
    x = 740,100.44/718.44
  6. Step 6: Final answer
    x = 1,030.15

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.