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Finding the Fourth Proportional to 916.56, 1,373.78 and 454.64

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Solution

The fourth proportional to 916.56, 1,373.78 and 454.64 is: 681.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.56 : 1,373.78 = 454.64 : x
  2. Step 2: Convert to fraction form
    916.56/1,373.78 = 454.64/x
  3. Step 3: Cross multiply
    916.56x = 1,373.78 × 454.64
  4. Step 4: Simplify right side
    916.56x = 624,567.90
  5. Step 5: Solve for x
    x = 624,567.90/916.56
  6. Step 6: Final answer
    x = 681.43

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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.