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Finding the Fourth Proportional to 612,228.28, 918,362.92 and 212,872.51

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Solution

The fourth proportional to 612,228.28, 918,362.92 and 212,872.51 is: 319,315.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,228.28 : 918,362.92 = 212,872.51 : x
  2. Step 2: Convert to fraction form
    612,228.28/918,362.92 = 212,872.51/x
  3. Step 3: Cross multiply
    612,228.28x = 918,362.92 × 212,872.51
  4. Step 4: Simplify right side
    612,228.28x = 195,494,215,279.52
  5. Step 5: Solve for x
    x = 195,494,215,279.52/612,228.28
  6. Step 6: Final answer
    x = 319,315.89

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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.