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Finding the Fourth Proportional to 1,188.57, 1,783.32 and 458.16

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Solution

The fourth proportional to 1,188.57, 1,783.32 and 458.16 is: 687.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.57 : 1,783.32 = 458.16 : x
  2. Step 2: Convert to fraction form
    1,188.57/1,783.32 = 458.16/x
  3. Step 3: Cross multiply
    1,188.57x = 1,783.32 × 458.16
  4. Step 4: Simplify right side
    1,188.57x = 817,037.49
  5. Step 5: Solve for x
    x = 817,037.49/1,188.57
  6. Step 6: Final answer
    x = 687.41

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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.