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Finding the Fourth Proportional to 713.80, 1,070.70 and 685.45

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Solution

The fourth proportional to 713.80, 1,070.70 and 685.45 is: 1,028.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.80 : 1,070.70 = 685.45 : x
  2. Step 2: Convert to fraction form
    713.80/1,070.70 = 685.45/x
  3. Step 3: Cross multiply
    713.80x = 1,070.70 × 685.45
  4. Step 4: Simplify right side
    713.80x = 733,911.32
  5. Step 5: Solve for x
    x = 733,911.32/713.80
  6. Step 6: Final answer
    x = 1,028.18

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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.