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Finding the Fourth Proportional to 850.74, 1,276.40 and 619.23

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Solution

The fourth proportional to 850.74, 1,276.40 and 619.23 is: 929.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    850.74 : 1,276.40 = 619.23 : x
  2. Step 2: Convert to fraction form
    850.74/1,276.40 = 619.23/x
  3. Step 3: Cross multiply
    850.74x = 1,276.40 × 619.23
  4. Step 4: Simplify right side
    850.74x = 790,385.17
  5. Step 5: Solve for x
    x = 790,385.17/850.74
  6. Step 6: Final answer
    x = 929.06

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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.