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Finding the Fourth Proportional to 914.39, 1,261.67 and 619.95

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Solution

The fourth proportional to 914.39, 1,261.67 and 619.95 is: 855.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.39 : 1,261.67 = 619.95 : x
  2. Step 2: Convert to fraction form
    914.39/1,261.67 = 619.95/x
  3. Step 3: Cross multiply
    914.39x = 1,261.67 × 619.95
  4. Step 4: Simplify right side
    914.39x = 782,169.22
  5. Step 5: Solve for x
    x = 782,169.22/914.39
  6. Step 6: Final answer
    x = 855.40

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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.