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Finding the Fourth Proportional to 913.64, 1,261.34 and 603.68

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Solution

The fourth proportional to 913.64, 1,261.34 and 603.68 is: 833.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.64 : 1,261.34 = 603.68 : x
  2. Step 2: Convert to fraction form
    913.64/1,261.34 = 603.68/x
  3. Step 3: Cross multiply
    913.64x = 1,261.34 × 603.68
  4. Step 4: Simplify right side
    913.64x = 761,445.73
  5. Step 5: Solve for x
    x = 761,445.73/913.64
  6. Step 6: Final answer
    x = 833.42

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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.