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Finding the Fourth Proportional to 887.42, 1,222.08 and 721.10

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Solution

The fourth proportional to 887.42, 1,222.08 and 721.10 is: 993.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.42 : 1,222.08 = 721.10 : x
  2. Step 2: Convert to fraction form
    887.42/1,222.08 = 721.10/x
  3. Step 3: Cross multiply
    887.42x = 1,222.08 × 721.10
  4. Step 4: Simplify right side
    887.42x = 881,241.89
  5. Step 5: Solve for x
    x = 881,241.89/887.42
  6. Step 6: Final answer
    x = 993.04

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Double scale
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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.