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Finding the Fourth Proportional to 840.23, 1,260.69 and 377.70

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Solution

The fourth proportional to 840.23, 1,260.69 and 377.70 is: 566.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.23 : 1,260.69 = 377.70 : x
  2. Step 2: Convert to fraction form
    840.23/1,260.69 = 377.70/x
  3. Step 3: Cross multiply
    840.23x = 1,260.69 × 377.70
  4. Step 4: Simplify right side
    840.23x = 476,160.72
  5. Step 5: Solve for x
    x = 476,160.72/840.23
  6. Step 6: Final answer
    x = 566.70

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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.