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Finding the Fourth Proportional to 1,355.86, 1,871.31 and 824.95

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Solution

The fourth proportional to 1,355.86, 1,871.31 and 824.95 is: 1,138.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,355.86 : 1,871.31 = 824.95 : x
  2. Step 2: Convert to fraction form
    1,355.86/1,871.31 = 824.95/x
  3. Step 3: Cross multiply
    1,355.86x = 1,871.31 × 824.95
  4. Step 4: Simplify right side
    1,355.86x = 1,543,737.18
  5. Step 5: Solve for x
    x = 1,543,737.18/1,355.86
  6. Step 6: Final answer
    x = 1,138.57

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.