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Finding the Fourth Proportional to 840.69, 1,261.80 and 402.17

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Solution

The fourth proportional to 840.69, 1,261.80 and 402.17 is: 603.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.69 : 1,261.80 = 402.17 : x
  2. Step 2: Convert to fraction form
    840.69/1,261.80 = 402.17/x
  3. Step 3: Cross multiply
    840.69x = 1,261.80 × 402.17
  4. Step 4: Simplify right side
    840.69x = 507,451.80
  5. Step 5: Solve for x
    x = 507,451.80/840.69
  6. Step 6: Final answer
    x = 603.61

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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.