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Finding the Fourth Proportional to 947.16, 1,420.92 and 557.82

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Solution

The fourth proportional to 947.16, 1,420.92 and 557.82 is: 836.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.16 : 1,420.92 = 557.82 : x
  2. Step 2: Convert to fraction form
    947.16/1,420.92 = 557.82/x
  3. Step 3: Cross multiply
    947.16x = 1,420.92 × 557.82
  4. Step 4: Simplify right side
    947.16x = 792,617.59
  5. Step 5: Solve for x
    x = 792,617.59/947.16
  6. Step 6: Final answer
    x = 836.84

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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.