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Finding the Fourth Proportional to 612.12, 918.72 and 531.12

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Solution

The fourth proportional to 612.12, 918.72 and 531.12 is: 797.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.12 : 918.72 = 531.12 : x
  2. Step 2: Convert to fraction form
    612.12/918.72 = 531.12/x
  3. Step 3: Cross multiply
    612.12x = 918.72 × 531.12
  4. Step 4: Simplify right side
    612.12x = 487,950.57
  5. Step 5: Solve for x
    x = 487,950.57/612.12
  6. Step 6: Final answer
    x = 797.15

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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.