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Finding the Fourth Proportional to 1,007.75, 1,510.68 and 917.57

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Solution

The fourth proportional to 1,007.75, 1,510.68 and 917.57 is: 1,375.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.75 : 1,510.68 = 917.57 : x
  2. Step 2: Convert to fraction form
    1,007.75/1,510.68 = 917.57/x
  3. Step 3: Cross multiply
    1,007.75x = 1,510.68 × 917.57
  4. Step 4: Simplify right side
    1,007.75x = 1,386,154.65
  5. Step 5: Solve for x
    x = 1,386,154.65/1,007.75
  6. Step 6: Final answer
    x = 1,375.49

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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.