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Finding the Fourth Proportional to 1,009.57, 1,392.28 and 655.12

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Solution

The fourth proportional to 1,009.57, 1,392.28 and 655.12 is: 903.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.57 : 1,392.28 = 655.12 : x
  2. Step 2: Convert to fraction form
    1,009.57/1,392.28 = 655.12/x
  3. Step 3: Cross multiply
    1,009.57x = 1,392.28 × 655.12
  4. Step 4: Simplify right side
    1,009.57x = 912,107.20
  5. Step 5: Solve for x
    x = 912,107.20/1,009.57
  6. Step 6: Final answer
    x = 903.47

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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.