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Finding the Fourth Proportional to 612,060.36, 918,238.14 and 212,643

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Solution

The fourth proportional to 612,060.36, 918,238.14 and 212,643 is: 319,015.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,060.36 : 918,238.14 = 212,643 : x
  2. Step 2: Convert to fraction form
    612,060.36/918,238.14 = 212,643/x
  3. Step 3: Cross multiply
    612,060.36x = 918,238.14 × 212,643
  4. Step 4: Simplify right side
    612,060.36x = 195,256,912,804.02
  5. Step 5: Solve for x
    x = 195,256,912,804.02/612,060.36
  6. Step 6: Final answer
    x = 319,015.78

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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.