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Finding the Fourth Proportional to 894.80, 1,340.40 and 621.20

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Solution

The fourth proportional to 894.80, 1,340.40 and 621.20 is: 930.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    894.80 : 1,340.40 = 621.20 : x
  2. Step 2: Convert to fraction form
    894.80/1,340.40 = 621.20/x
  3. Step 3: Cross multiply
    894.80x = 1,340.40 × 621.20
  4. Step 4: Simplify right side
    894.80x = 832,656.48
  5. Step 5: Solve for x
    x = 832,656.48/894.80
  6. Step 6: Final answer
    x = 930.55

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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.