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Finding the Fourth Proportional to 840.13, 1,258.90 and 352.91

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Solution

The fourth proportional to 840.13, 1,258.90 and 352.91 is: 528.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.13 : 1,258.90 = 352.91 : x
  2. Step 2: Convert to fraction form
    840.13/1,258.90 = 352.91/x
  3. Step 3: Cross multiply
    840.13x = 1,258.90 × 352.91
  4. Step 4: Simplify right side
    840.13x = 444,278.40
  5. Step 5: Solve for x
    x = 444,278.40/840.13
  6. Step 6: Final answer
    x = 528.82

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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.