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Finding the Fourth Proportional to 1,555.58, 2,332.81 and 515.39

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Solution

The fourth proportional to 1,555.58, 2,332.81 and 515.39 is: 772.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,555.58 : 2,332.81 = 515.39 : x
  2. Step 2: Convert to fraction form
    1,555.58/2,332.81 = 515.39/x
  3. Step 3: Cross multiply
    1,555.58x = 2,332.81 × 515.39
  4. Step 4: Simplify right side
    1,555.58x = 1,202,306.95
  5. Step 5: Solve for x
    x = 1,202,306.95/1,555.58
  6. Step 6: Final answer
    x = 772.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.