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Finding the Fourth Proportional to 556.18, 767.68 and 390.43

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Solution

The fourth proportional to 556.18, 767.68 and 390.43 is: 538.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    556.18 : 767.68 = 390.43 : x
  2. Step 2: Convert to fraction form
    556.18/767.68 = 390.43/x
  3. Step 3: Cross multiply
    556.18x = 767.68 × 390.43
  4. Step 4: Simplify right side
    556.18x = 299,725.30
  5. Step 5: Solve for x
    x = 299,725.30/556.18
  6. Step 6: Final answer
    x = 538.90

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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.