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Finding the Fourth Proportional to 64,979.94, 89,686.53 and 41,138.40

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Solution

The fourth proportional to 64,979.94, 89,686.53 and 41,138.40 is: 56,779.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,979.94 : 89,686.53 = 41,138.40 : x
  2. Step 2: Convert to fraction form
    64,979.94/89,686.53 = 41,138.40/x
  3. Step 3: Cross multiply
    64,979.94x = 89,686.53 × 41,138.40
  4. Step 4: Simplify right side
    64,979.94x = 3,689,560,345.75
  5. Step 5: Solve for x
    x = 3,689,560,345.75/64,979.94
  6. Step 6: Final answer
    x = 56,779.99

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.