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Finding the Fourth Proportional to 841.10, 1,261.85 and 423.59

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Solution

The fourth proportional to 841.10, 1,261.85 and 423.59 is: 635.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.10 : 1,261.85 = 423.59 : x
  2. Step 2: Convert to fraction form
    841.10/1,261.85 = 423.59/x
  3. Step 3: Cross multiply
    841.10x = 1,261.85 × 423.59
  4. Step 4: Simplify right side
    841.10x = 534,509.14
  5. Step 5: Solve for x
    x = 534,509.14/841.10
  6. Step 6: Final answer
    x = 635.49

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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.