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Finding the Fourth Proportional to 947.07, 1,421.04 and 427.21

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Solution

The fourth proportional to 947.07, 1,421.04 and 427.21 is: 641.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.07 : 1,421.04 = 427.21 : x
  2. Step 2: Convert to fraction form
    947.07/1,421.04 = 427.21/x
  3. Step 3: Cross multiply
    947.07x = 1,421.04 × 427.21
  4. Step 4: Simplify right side
    947.07x = 607,082.50
  5. Step 5: Solve for x
    x = 607,082.50/947.07
  6. Step 6: Final answer
    x = 641.01

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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.