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Finding the Fourth Proportional to 987.34, 1,361.61 and 673.06

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Solution

The fourth proportional to 987.34, 1,361.61 and 673.06 is: 928.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.34 : 1,361.61 = 673.06 : x
  2. Step 2: Convert to fraction form
    987.34/1,361.61 = 673.06/x
  3. Step 3: Cross multiply
    987.34x = 1,361.61 × 673.06
  4. Step 4: Simplify right side
    987.34x = 916,444.38
  5. Step 5: Solve for x
    x = 916,444.38/987.34
  6. Step 6: Final answer
    x = 928.20

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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.