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Finding the Fourth Proportional to 756.93, 1,135.78 and 345.98

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Solution

The fourth proportional to 756.93, 1,135.78 and 345.98 is: 519.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.93 : 1,135.78 = 345.98 : x
  2. Step 2: Convert to fraction form
    756.93/1,135.78 = 345.98/x
  3. Step 3: Cross multiply
    756.93x = 1,135.78 × 345.98
  4. Step 4: Simplify right side
    756.93x = 392,959.14
  5. Step 5: Solve for x
    x = 392,959.14/756.93
  6. Step 6: Final answer
    x = 519.15

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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.