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Finding the Fourth Proportional to 916.40, 1,374.75 and 454.20

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Solution

The fourth proportional to 916.40, 1,374.75 and 454.20 is: 681.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.40 : 1,374.75 = 454.20 : x
  2. Step 2: Convert to fraction form
    916.40/1,374.75 = 454.20/x
  3. Step 3: Cross multiply
    916.40x = 1,374.75 × 454.20
  4. Step 4: Simplify right side
    916.40x = 624,402.31
  5. Step 5: Solve for x
    x = 624,402.31/916.40
  6. Step 6: Final answer
    x = 681.37

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Double scale
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1.5x scale

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.