Home / 428,213.17-642,718.28-218,008.45

Finding the Fourth Proportional to 428,213.17, 642,718.28 and 218,008.45

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Solution

The fourth proportional to 428,213.17, 642,718.28 and 218,008.45 is: 327,215.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,213.17 : 642,718.28 = 218,008.45 : x
  2. Step 2: Convert to fraction form
    428,213.17/642,718.28 = 218,008.45/x
  3. Step 3: Cross multiply
    428,213.17x = 642,718.28 × 218,008.45
  4. Step 4: Simplify right side
    428,213.17x = 140,118,013,312.63
  5. Step 5: Solve for x
    x = 140,118,013,312.63/428,213.17
  6. Step 6: Final answer
    x = 327,215.56

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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.