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Finding the Fourth Proportional to 907.78, 1,253.16 and 613.52

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Solution

The fourth proportional to 907.78, 1,253.16 and 613.52 is: 846.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.78 : 1,253.16 = 613.52 : x
  2. Step 2: Convert to fraction form
    907.78/1,253.16 = 613.52/x
  3. Step 3: Cross multiply
    907.78x = 1,253.16 × 613.52
  4. Step 4: Simplify right side
    907.78x = 768,838.72
  5. Step 5: Solve for x
    x = 768,838.72/907.78
  6. Step 6: Final answer
    x = 846.94

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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.