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Finding the Fourth Proportional to 917.50, 1,374.54 and 454.75

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Solution

The fourth proportional to 917.50, 1,374.54 and 454.75 is: 681.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.50 : 1,374.54 = 454.75 : x
  2. Step 2: Convert to fraction form
    917.50/1,374.54 = 454.75/x
  3. Step 3: Cross multiply
    917.50x = 1,374.54 × 454.75
  4. Step 4: Simplify right side
    917.50x = 625,072.07
  5. Step 5: Solve for x
    x = 625,072.07/917.50
  6. Step 6: Final answer
    x = 681.28

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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.