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Finding the Fourth Proportional to 1,222.80, 1,686.15 and 829.14

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Solution

The fourth proportional to 1,222.80, 1,686.15 and 829.14 is: 1,143.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,222.80 : 1,686.15 = 829.14 : x
  2. Step 2: Convert to fraction form
    1,222.80/1,686.15 = 829.14/x
  3. Step 3: Cross multiply
    1,222.80x = 1,686.15 × 829.14
  4. Step 4: Simplify right side
    1,222.80x = 1,398,054.41
  5. Step 5: Solve for x
    x = 1,398,054.41/1,222.80
  6. Step 6: Final answer
    x = 1,143.32

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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.