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Finding the Fourth Proportional to 1,328.64, 1,990.08 and 893.76

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Solution

The fourth proportional to 1,328.64, 1,990.08 and 893.76 is: 1,338.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.64 : 1,990.08 = 893.76 : x
  2. Step 2: Convert to fraction form
    1,328.64/1,990.08 = 893.76/x
  3. Step 3: Cross multiply
    1,328.64x = 1,990.08 × 893.76
  4. Step 4: Simplify right side
    1,328.64x = 1,778,653.90
  5. Step 5: Solve for x
    x = 1,778,653.90/1,328.64
  6. Step 6: Final answer
    x = 1,338.70

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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.