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Finding the Fourth Proportional to 1,188.59, 1,783.08 and 640.62

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Solution

The fourth proportional to 1,188.59, 1,783.08 and 640.62 is: 961.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.59 : 1,783.08 = 640.62 : x
  2. Step 2: Convert to fraction form
    1,188.59/1,783.08 = 640.62/x
  3. Step 3: Cross multiply
    1,188.59x = 1,783.08 × 640.62
  4. Step 4: Simplify right side
    1,188.59x = 1,142,276.71
  5. Step 5: Solve for x
    x = 1,142,276.71/1,188.59
  6. Step 6: Final answer
    x = 961.04

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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.