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Finding the Fourth Proportional to 707.80, 1,062.90 and 686.20

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Solution

The fourth proportional to 707.80, 1,062.90 and 686.20 is: 1,030.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.80 : 1,062.90 = 686.20 : x
  2. Step 2: Convert to fraction form
    707.80/1,062.90 = 686.20/x
  3. Step 3: Cross multiply
    707.80x = 1,062.90 × 686.20
  4. Step 4: Simplify right side
    707.80x = 729,361.98
  5. Step 5: Solve for x
    x = 729,361.98/707.80
  6. Step 6: Final answer
    x = 1,030.46

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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.