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Finding the Fourth Proportional to 883.10, 1,218.78 and 551.55

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Solution

The fourth proportional to 883.10, 1,218.78 and 551.55 is: 761.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    883.10 : 1,218.78 = 551.55 : x
  2. Step 2: Convert to fraction form
    883.10/1,218.78 = 551.55/x
  3. Step 3: Cross multiply
    883.10x = 1,218.78 × 551.55
  4. Step 4: Simplify right side
    883.10x = 672,218.11
  5. Step 5: Solve for x
    x = 672,218.11/883.10
  6. Step 6: Final answer
    x = 761.21

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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.