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Finding the Fourth Proportional to 1,011.79, 1,396.07 and 618.53

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Solution

The fourth proportional to 1,011.79, 1,396.07 and 618.53 is: 853.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.79 : 1,396.07 = 618.53 : x
  2. Step 2: Convert to fraction form
    1,011.79/1,396.07 = 618.53/x
  3. Step 3: Cross multiply
    1,011.79x = 1,396.07 × 618.53
  4. Step 4: Simplify right side
    1,011.79x = 863,513.31
  5. Step 5: Solve for x
    x = 863,513.31/1,011.79
  6. Step 6: Final answer
    x = 853.45

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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.