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Finding the Fourth Proportional to 1,007.40, 1,511.10 and 485.82

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Solution

The fourth proportional to 1,007.40, 1,511.10 and 485.82 is: 728.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.40 : 1,511.10 = 485.82 : x
  2. Step 2: Convert to fraction form
    1,007.40/1,511.10 = 485.82/x
  3. Step 3: Cross multiply
    1,007.40x = 1,511.10 × 485.82
  4. Step 4: Simplify right side
    1,007.40x = 734,115.05
  5. Step 5: Solve for x
    x = 734,115.05/1,007.40
  6. Step 6: Final answer
    x = 728.72

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Double scale
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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.