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Finding the Fourth Proportional to 556.01, 765.95 and 389.90

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Solution

The fourth proportional to 556.01, 765.95 and 389.90 is: 537.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    556.01 : 765.95 = 389.90 : x
  2. Step 2: Convert to fraction form
    556.01/765.95 = 389.90/x
  3. Step 3: Cross multiply
    556.01x = 765.95 × 389.90
  4. Step 4: Simplify right side
    556.01x = 298,641.96
  5. Step 5: Solve for x
    x = 298,641.96/556.01
  6. Step 6: Final answer
    x = 537.12

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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.