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Finding the Fourth Proportional to 926.15, 1,389.18 and 276.86

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Solution

The fourth proportional to 926.15, 1,389.18 and 276.86 is: 415.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.15 : 1,389.18 = 276.86 : x
  2. Step 2: Convert to fraction form
    926.15/1,389.18 = 276.86/x
  3. Step 3: Cross multiply
    926.15x = 1,389.18 × 276.86
  4. Step 4: Simplify right side
    926.15x = 384,612.89
  5. Step 5: Solve for x
    x = 384,612.89/926.15
  6. Step 6: Final answer
    x = 415.28

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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.