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Finding the Fourth Proportional to 926.55, 1,389.83 and 268.40

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Solution

The fourth proportional to 926.55, 1,389.83 and 268.40 is: 402.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.55 : 1,389.83 = 268.40 : x
  2. Step 2: Convert to fraction form
    926.55/1,389.83 = 268.40/x
  3. Step 3: Cross multiply
    926.55x = 1,389.83 × 268.40
  4. Step 4: Simplify right side
    926.55x = 373,022.08
  5. Step 5: Solve for x
    x = 373,022.08/926.55
  6. Step 6: Final answer
    x = 402.59

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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.