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Finding the Fourth Proportional to 926.91, 1,389.36 and 371.40

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Solution

The fourth proportional to 926.91, 1,389.36 and 371.40 is: 556.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.91 : 1,389.36 = 371.40 : x
  2. Step 2: Convert to fraction form
    926.91/1,389.36 = 371.40/x
  3. Step 3: Cross multiply
    926.91x = 1,389.36 × 371.40
  4. Step 4: Simplify right side
    926.91x = 516,008.30
  5. Step 5: Solve for x
    x = 516,008.30/926.91
  6. Step 6: Final answer
    x = 556.70

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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.