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Finding the Fourth Proportional to 926.34, 1,388.28 and 438.30

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Solution

The fourth proportional to 926.34, 1,388.28 and 438.30 is: 656.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.34 : 1,388.28 = 438.30 : x
  2. Step 2: Convert to fraction form
    926.34/1,388.28 = 438.30/x
  3. Step 3: Cross multiply
    926.34x = 1,388.28 × 438.30
  4. Step 4: Simplify right side
    926.34x = 608,483.12
  5. Step 5: Solve for x
    x = 608,483.12/926.34
  6. Step 6: Final answer
    x = 656.87

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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.