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Finding the Fourth Proportional to 556.20, 766.80 and 390.24

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Solution

The fourth proportional to 556.20, 766.80 and 390.24 is: 538.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    556.20 : 766.80 = 390.24 : x
  2. Step 2: Convert to fraction form
    556.20/766.80 = 390.24/x
  3. Step 3: Cross multiply
    556.20x = 766.80 × 390.24
  4. Step 4: Simplify right side
    556.20x = 299,236.03
  5. Step 5: Solve for x
    x = 299,236.03/556.20
  6. Step 6: Final answer
    x = 538.00

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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.