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Finding the Fourth Proportional to 926.18, 1,389.26 and 425.79

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Solution

The fourth proportional to 926.18, 1,389.26 and 425.79 is: 638.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.18 : 1,389.26 = 425.79 : x
  2. Step 2: Convert to fraction form
    926.18/1,389.26 = 425.79/x
  3. Step 3: Cross multiply
    926.18x = 1,389.26 × 425.79
  4. Step 4: Simplify right side
    926.18x = 591,530.89
  5. Step 5: Solve for x
    x = 591,530.89/926.18
  6. Step 6: Final answer
    x = 638.68

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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.