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Finding the Fourth Proportional to 703.20, 1,054.80 and 689.70

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Solution

The fourth proportional to 703.20, 1,054.80 and 689.70 is: 1,034.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    703.20 : 1,054.80 = 689.70 : x
  2. Step 2: Convert to fraction form
    703.20/1,054.80 = 689.70/x
  3. Step 3: Cross multiply
    703.20x = 1,054.80 × 689.70
  4. Step 4: Simplify right side
    703.20x = 727,495.56
  5. Step 5: Solve for x
    x = 727,495.56/703.20
  6. Step 6: Final answer
    x = 1,034.55

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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.