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Finding the Fourth Proportional to 1,007.24, 1,389.81 and 653.64

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Solution

The fourth proportional to 1,007.24, 1,389.81 and 653.64 is: 901.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.24 : 1,389.81 = 653.64 : x
  2. Step 2: Convert to fraction form
    1,007.24/1,389.81 = 653.64/x
  3. Step 3: Cross multiply
    1,007.24x = 1,389.81 × 653.64
  4. Step 4: Simplify right side
    1,007.24x = 908,432.65
  5. Step 5: Solve for x
    x = 908,432.65/1,007.24
  6. Step 6: Final answer
    x = 901.91

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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.