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Finding the Fourth Proportional to 891.04, 1,228.14 and 678.28

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Solution

The fourth proportional to 891.04, 1,228.14 and 678.28 is: 934.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.04 : 1,228.14 = 678.28 : x
  2. Step 2: Convert to fraction form
    891.04/1,228.14 = 678.28/x
  3. Step 3: Cross multiply
    891.04x = 1,228.14 × 678.28
  4. Step 4: Simplify right side
    891.04x = 833,022.80
  5. Step 5: Solve for x
    x = 833,022.80/891.04
  6. Step 6: Final answer
    x = 934.89

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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.