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Finding the Fourth Proportional to 1,188.08, 1,639.44 and 663.92

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Solution

The fourth proportional to 1,188.08, 1,639.44 and 663.92 is: 916.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.08 : 1,639.44 = 663.92 : x
  2. Step 2: Convert to fraction form
    1,188.08/1,639.44 = 663.92/x
  3. Step 3: Cross multiply
    1,188.08x = 1,639.44 × 663.92
  4. Step 4: Simplify right side
    1,188.08x = 1,088,457.00
  5. Step 5: Solve for x
    x = 1,088,457.00/1,188.08
  6. Step 6: Final answer
    x = 916.15

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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.