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Finding the Fourth Proportional to 841.10, 1,261.10 and 402.11

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Solution

The fourth proportional to 841.10, 1,261.10 and 402.11 is: 602.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.10 : 1,261.10 = 402.11 : x
  2. Step 2: Convert to fraction form
    841.10/1,261.10 = 402.11/x
  3. Step 3: Cross multiply
    841.10x = 1,261.10 × 402.11
  4. Step 4: Simplify right side
    841.10x = 507,092.60
  5. Step 5: Solve for x
    x = 507,092.60/841.10
  6. Step 6: Final answer
    x = 602.90

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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.