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Finding the Fourth Proportional to 840.74, 1,261.13 and 402.03

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Solution

The fourth proportional to 840.74, 1,261.13 and 402.03 is: 603.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.74 : 1,261.13 = 402.03 : x
  2. Step 2: Convert to fraction form
    840.74/1,261.13 = 402.03/x
  3. Step 3: Cross multiply
    840.74x = 1,261.13 × 402.03
  4. Step 4: Simplify right side
    840.74x = 507,010.08
  5. Step 5: Solve for x
    x = 507,010.08/840.74
  6. Step 6: Final answer
    x = 603.06

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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.