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Finding the Fourth Proportional to 478.77, 660.78 and 279.68

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Solution

The fourth proportional to 478.77, 660.78 and 279.68 is: 386.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.77 : 660.78 = 279.68 : x
  2. Step 2: Convert to fraction form
    478.77/660.78 = 279.68/x
  3. Step 3: Cross multiply
    478.77x = 660.78 × 279.68
  4. Step 4: Simplify right side
    478.77x = 184,803.65
  5. Step 5: Solve for x
    x = 184,803.65/478.77
  6. Step 6: Final answer
    x = 386.00

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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.