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Finding the Fourth Proportional to 556.72, 767.48 and 390.42

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Solution

The fourth proportional to 556.72, 767.48 and 390.42 is: 538.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    556.72 : 767.48 = 390.42 : x
  2. Step 2: Convert to fraction form
    556.72/767.48 = 390.42/x
  3. Step 3: Cross multiply
    556.72x = 767.48 × 390.42
  4. Step 4: Simplify right side
    556.72x = 299,639.54
  5. Step 5: Solve for x
    x = 299,639.54/556.72
  6. Step 6: Final answer
    x = 538.22

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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.