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Finding the Fourth Proportional to 926.47, 1,389.30 and 439.66

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Solution

The fourth proportional to 926.47, 1,389.30 and 439.66 is: 659.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.47 : 1,389.30 = 439.66 : x
  2. Step 2: Convert to fraction form
    926.47/1,389.30 = 439.66/x
  3. Step 3: Cross multiply
    926.47x = 1,389.30 × 439.66
  4. Step 4: Simplify right side
    926.47x = 610,819.64
  5. Step 5: Solve for x
    x = 610,819.64/926.47
  6. Step 6: Final answer
    x = 659.30

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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.