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Finding the Fourth Proportional to 528.12, 790.55 and 412.90

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Solution

The fourth proportional to 528.12, 790.55 and 412.90 is: 618.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.12 : 790.55 = 412.90 : x
  2. Step 2: Convert to fraction form
    528.12/790.55 = 412.90/x
  3. Step 3: Cross multiply
    528.12x = 790.55 × 412.90
  4. Step 4: Simplify right side
    528.12x = 326,418.10
  5. Step 5: Solve for x
    x = 326,418.10/528.12
  6. Step 6: Final answer
    x = 618.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.