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Finding the Fourth Proportional to 479.79, 661.69 and 386.50

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Solution

The fourth proportional to 479.79, 661.69 and 386.50 is: 533.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.79 : 661.69 = 386.50 : x
  2. Step 2: Convert to fraction form
    479.79/661.69 = 386.50/x
  3. Step 3: Cross multiply
    479.79x = 661.69 × 386.50
  4. Step 4: Simplify right side
    479.79x = 255,743.19
  5. Step 5: Solve for x
    x = 255,743.19/479.79
  6. Step 6: Final answer
    x = 533.03

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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.