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Finding the Fourth Proportional to 914.50, 1,261.56 and 619.86

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Solution

The fourth proportional to 914.50, 1,261.56 and 619.86 is: 855.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.50 : 1,261.56 = 619.86 : x
  2. Step 2: Convert to fraction form
    914.50/1,261.56 = 619.86/x
  3. Step 3: Cross multiply
    914.50x = 1,261.56 × 619.86
  4. Step 4: Simplify right side
    914.50x = 781,990.58
  5. Step 5: Solve for x
    x = 781,990.58/914.50
  6. Step 6: Final answer
    x = 855.10

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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.