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Finding the Fourth Proportional to 840.64, 1,262.40 and 670.72

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Solution

The fourth proportional to 840.64, 1,262.40 and 670.72 is: 1,007.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.64 : 1,262.40 = 670.72 : x
  2. Step 2: Convert to fraction form
    840.64/1,262.40 = 670.72/x
  3. Step 3: Cross multiply
    840.64x = 1,262.40 × 670.72
  4. Step 4: Simplify right side
    840.64x = 846,716.93
  5. Step 5: Solve for x
    x = 846,716.93/840.64
  6. Step 6: Final answer
    x = 1,007.23

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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.