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Finding the Fourth Proportional to 926.25, 1,389.29 and 438.99

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Solution

The fourth proportional to 926.25, 1,389.29 and 438.99 is: 658.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.25 : 1,389.29 = 438.99 : x
  2. Step 2: Convert to fraction form
    926.25/1,389.29 = 438.99/x
  3. Step 3: Cross multiply
    926.25x = 1,389.29 × 438.99
  4. Step 4: Simplify right side
    926.25x = 609,882.22
  5. Step 5: Solve for x
    x = 609,882.22/926.25
  6. Step 6: Final answer
    x = 658.44

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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.