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Finding the Fourth Proportional to 937.73, 1,407.21 and 389.91

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Solution

The fourth proportional to 937.73, 1,407.21 and 389.91 is: 585.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    937.73 : 1,407.21 = 389.91 : x
  2. Step 2: Convert to fraction form
    937.73/1,407.21 = 389.91/x
  3. Step 3: Cross multiply
    937.73x = 1,407.21 × 389.91
  4. Step 4: Simplify right side
    937.73x = 548,678.51
  5. Step 5: Solve for x
    x = 548,678.51/937.73
  6. Step 6: Final answer
    x = 585.12

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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.