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Finding the Fourth Proportional to 947.66, 1,420.38 and 427.06

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Solution

The fourth proportional to 947.66, 1,420.38 and 427.06 is: 640.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.66 : 1,420.38 = 427.06 : x
  2. Step 2: Convert to fraction form
    947.66/1,420.38 = 427.06/x
  3. Step 3: Cross multiply
    947.66x = 1,420.38 × 427.06
  4. Step 4: Simplify right side
    947.66x = 606,583.93
  5. Step 5: Solve for x
    x = 606,583.93/947.66
  6. Step 6: Final answer
    x = 640.08

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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.