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Finding the Fourth Proportional to 947.31, 1,421.17 and 370.19

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Solution

The fourth proportional to 947.31, 1,421.17 and 370.19 is: 555.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.31 : 1,421.17 = 370.19 : x
  2. Step 2: Convert to fraction form
    947.31/1,421.17 = 370.19/x
  3. Step 3: Cross multiply
    947.31x = 1,421.17 × 370.19
  4. Step 4: Simplify right side
    947.31x = 526,102.92
  5. Step 5: Solve for x
    x = 526,102.92/947.31
  6. Step 6: Final answer
    x = 555.37

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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.