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Finding the Fourth Proportional to 840.89, 1,258.47 and 767.86

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Solution

The fourth proportional to 840.89, 1,258.47 and 767.86 is: 1,149.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.89 : 1,258.47 = 767.86 : x
  2. Step 2: Convert to fraction form
    840.89/1,258.47 = 767.86/x
  3. Step 3: Cross multiply
    840.89x = 1,258.47 × 767.86
  4. Step 4: Simplify right side
    840.89x = 966,325.63
  5. Step 5: Solve for x
    x = 966,325.63/840.89
  6. Step 6: Final answer
    x = 1,149.17

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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.