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Finding the Fourth Proportional to 428,486.90, 642,510.02 and 251,343.14

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Solution

The fourth proportional to 428,486.90, 642,510.02 and 251,343.14 is: 376,885.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,486.90 : 642,510.02 = 251,343.14 : x
  2. Step 2: Convert to fraction form
    428,486.90/642,510.02 = 251,343.14/x
  3. Step 3: Cross multiply
    428,486.90x = 642,510.02 × 251,343.14
  4. Step 4: Simplify right side
    428,486.90x = 161,490,483,324.07
  5. Step 5: Solve for x
    x = 161,490,483,324.07/428,486.90
  6. Step 6: Final answer
    x = 376,885.47

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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.