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Finding the Fourth Proportional to 1,011.28, 1,395.12 and 618.28

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Solution

The fourth proportional to 1,011.28, 1,395.12 and 618.28 is: 852.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.28 : 1,395.12 = 618.28 : x
  2. Step 2: Convert to fraction form
    1,011.28/1,395.12 = 618.28/x
  3. Step 3: Cross multiply
    1,011.28x = 1,395.12 × 618.28
  4. Step 4: Simplify right side
    1,011.28x = 862,574.79
  5. Step 5: Solve for x
    x = 862,574.79/1,011.28
  6. Step 6: Final answer
    x = 852.95

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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.