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Finding the Fourth Proportional to 926.79, 1,389.78 and 439.98

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Solution

The fourth proportional to 926.79, 1,389.78 and 439.98 is: 659.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.79 : 1,389.78 = 439.98 : x
  2. Step 2: Convert to fraction form
    926.79/1,389.78 = 439.98/x
  3. Step 3: Cross multiply
    926.79x = 1,389.78 × 439.98
  4. Step 4: Simplify right side
    926.79x = 611,475.40
  5. Step 5: Solve for x
    x = 611,475.40/926.79
  6. Step 6: Final answer
    x = 659.78

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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.