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Finding the Fourth Proportional to 905,139, 1,357,883.28 and 344,129.76

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Solution

The fourth proportional to 905,139, 1,357,883.28 and 344,129.76 is: 516,261.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    905,139 : 1,357,883.28 = 344,129.76 : x
  2. Step 2: Convert to fraction form
    905,139/1,357,883.28 = 344,129.76/x
  3. Step 3: Cross multiply
    905,139x = 1,357,883.28 × 344,129.76
  4. Step 4: Simplify right side
    905,139x = 467,288,047,254.41
  5. Step 5: Solve for x
    x = 467,288,047,254.41/905,139
  6. Step 6: Final answer
    x = 516,261.09

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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.