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Finding the Fourth Proportional to 841.48, 1,261.74 and 613

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Solution

The fourth proportional to 841.48, 1,261.74 and 613 is: 919.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.48 : 1,261.74 = 613 : x
  2. Step 2: Convert to fraction form
    841.48/1,261.74 = 613/x
  3. Step 3: Cross multiply
    841.48x = 1,261.74 × 613
  4. Step 4: Simplify right side
    841.48x = 773,446.62
  5. Step 5: Solve for x
    x = 773,446.62/841.48
  6. Step 6: Final answer
    x = 919.15

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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.