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Finding the Fourth Proportional to 947.94, 1,420.74 and 427.79

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Solution

The fourth proportional to 947.94, 1,420.74 and 427.79 is: 641.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.94 : 1,420.74 = 427.79 : x
  2. Step 2: Convert to fraction form
    947.94/1,420.74 = 427.79/x
  3. Step 3: Cross multiply
    947.94x = 1,420.74 × 427.79
  4. Step 4: Simplify right side
    947.94x = 607,781.21
  5. Step 5: Solve for x
    x = 607,781.21/947.94
  6. Step 6: Final answer
    x = 641.16

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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.