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Finding the Fourth Proportional to 1,007.45, 1,389.54 and 963.29

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Solution

The fourth proportional to 1,007.45, 1,389.54 and 963.29 is: 1,328.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.45 : 1,389.54 = 963.29 : x
  2. Step 2: Convert to fraction form
    1,007.45/1,389.54 = 963.29/x
  3. Step 3: Cross multiply
    1,007.45x = 1,389.54 × 963.29
  4. Step 4: Simplify right side
    1,007.45x = 1,338,531.65
  5. Step 5: Solve for x
    x = 1,338,531.65/1,007.45
  6. Step 6: Final answer
    x = 1,328.63

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.