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Finding the Fourth Proportional to 840.55, 1,260.07 and 401.53

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Solution

The fourth proportional to 840.55, 1,260.07 and 401.53 is: 601.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.55 : 1,260.07 = 401.53 : x
  2. Step 2: Convert to fraction form
    840.55/1,260.07 = 401.53/x
  3. Step 3: Cross multiply
    840.55x = 1,260.07 × 401.53
  4. Step 4: Simplify right side
    840.55x = 505,955.91
  5. Step 5: Solve for x
    x = 505,955.91/840.55
  6. Step 6: Final answer
    x = 601.93

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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.