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Finding the Fourth Proportional to 1,011.39, 1,395.72 and 618.63

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Solution

The fourth proportional to 1,011.39, 1,395.72 and 618.63 is: 853.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.39 : 1,395.72 = 618.63 : x
  2. Step 2: Convert to fraction form
    1,011.39/1,395.72 = 618.63/x
  3. Step 3: Cross multiply
    1,011.39x = 1,395.72 × 618.63
  4. Step 4: Simplify right side
    1,011.39x = 863,434.26
  5. Step 5: Solve for x
    x = 863,434.26/1,011.39
  6. Step 6: Final answer
    x = 853.71

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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.