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Finding the Fourth Proportional to 1,093.86, 1,639.65 and 477.40

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Solution

The fourth proportional to 1,093.86, 1,639.65 and 477.40 is: 715.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,093.86 : 1,639.65 = 477.40 : x
  2. Step 2: Convert to fraction form
    1,093.86/1,639.65 = 477.40/x
  3. Step 3: Cross multiply
    1,093.86x = 1,639.65 × 477.40
  4. Step 4: Simplify right side
    1,093.86x = 782,766.99
  5. Step 5: Solve for x
    x = 782,766.99/1,093.86
  6. Step 6: Final answer
    x = 715.60

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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.