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Finding the Fourth Proportional to 517,462.72, 776,139.47 and 138,421.72

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Solution

The fourth proportional to 517,462.72, 776,139.47 and 138,421.72 is: 207,617.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    517,462.72 : 776,139.47 = 138,421.72 : x
  2. Step 2: Convert to fraction form
    517,462.72/776,139.47 = 138,421.72/x
  3. Step 3: Cross multiply
    517,462.72x = 776,139.47 × 138,421.72
  4. Step 4: Simplify right side
    517,462.72x = 107,434,561,194.44
  5. Step 5: Solve for x
    x = 107,434,561,194.44/517,462.72
  6. Step 6: Final answer
    x = 207,617.97

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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.