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Finding the Fourth Proportional to 717.88, 1,069.61 and 670.74

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Solution

The fourth proportional to 717.88, 1,069.61 and 670.74 is: 999.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.88 : 1,069.61 = 670.74 : x
  2. Step 2: Convert to fraction form
    717.88/1,069.61 = 670.74/x
  3. Step 3: Cross multiply
    717.88x = 1,069.61 × 670.74
  4. Step 4: Simplify right side
    717.88x = 717,430.21
  5. Step 5: Solve for x
    x = 717,430.21/717.88
  6. Step 6: Final answer
    x = 999.37

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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.