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Finding the Fourth Proportional to 916.71, 1,374.45 and 454.70

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Solution

The fourth proportional to 916.71, 1,374.45 and 454.70 is: 681.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.71 : 1,374.45 = 454.70 : x
  2. Step 2: Convert to fraction form
    916.71/1,374.45 = 454.70/x
  3. Step 3: Cross multiply
    916.71x = 1,374.45 × 454.70
  4. Step 4: Simplify right side
    916.71x = 624,962.42
  5. Step 5: Solve for x
    x = 624,962.42/916.71
  6. Step 6: Final answer
    x = 681.74

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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.