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Finding the Fourth Proportional to 874.80, 1,206.36 and 678.24

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Solution

The fourth proportional to 874.80, 1,206.36 and 678.24 is: 935.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.80 : 1,206.36 = 678.24 : x
  2. Step 2: Convert to fraction form
    874.80/1,206.36 = 678.24/x
  3. Step 3: Cross multiply
    874.80x = 1,206.36 × 678.24
  4. Step 4: Simplify right side
    874.80x = 818,201.61
  5. Step 5: Solve for x
    x = 818,201.61/874.80
  6. Step 6: Final answer
    x = 935.30

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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.