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Finding the Fourth Proportional to 926.45, 1,381.86 and 787.94

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Solution

The fourth proportional to 926.45, 1,381.86 and 787.94 is: 1,175.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.45 : 1,381.86 = 787.94 : x
  2. Step 2: Convert to fraction form
    926.45/1,381.86 = 787.94/x
  3. Step 3: Cross multiply
    926.45x = 1,381.86 × 787.94
  4. Step 4: Simplify right side
    926.45x = 1,088,822.77
  5. Step 5: Solve for x
    x = 1,088,822.77/926.45
  6. Step 6: Final answer
    x = 1,175.26

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.