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Finding the Fourth Proportional to 1,223.40, 1,686.48 and 868.80

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Solution

The fourth proportional to 1,223.40, 1,686.48 and 868.80 is: 1,197.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223.40 : 1,686.48 = 868.80 : x
  2. Step 2: Convert to fraction form
    1,223.40/1,686.48 = 868.80/x
  3. Step 3: Cross multiply
    1,223.40x = 1,686.48 × 868.80
  4. Step 4: Simplify right side
    1,223.40x = 1,465,213.82
  5. Step 5: Solve for x
    x = 1,465,213.82/1,223.40
  6. Step 6: Final answer
    x = 1,197.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.