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Finding the Fourth Proportional to 911.10, 1,317.45 and 911.10

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Solution

The fourth proportional to 911.10, 1,317.45 and 911.10 is: 1,317.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.10 : 1,317.45 = 911.10 : x
  2. Step 2: Convert to fraction form
    911.10/1,317.45 = 911.10/x
  3. Step 3: Cross multiply
    911.10x = 1,317.45 × 911.10
  4. Step 4: Simplify right side
    911.10x = 1,200,328.70
  5. Step 5: Solve for x
    x = 1,200,328.70/911.10
  6. Step 6: Final answer
    x = 1,317.45

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.