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Finding the Fourth Proportional to 64,721, 89,317.14 and 39,565.64

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Solution

The fourth proportional to 64,721, 89,317.14 and 39,565.64 is: 54,601.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,721 : 89,317.14 = 39,565.64 : x
  2. Step 2: Convert to fraction form
    64,721/89,317.14 = 39,565.64/x
  3. Step 3: Cross multiply
    64,721x = 89,317.14 × 39,565.64
  4. Step 4: Simplify right side
    64,721x = 3,533,889,807.07
  5. Step 5: Solve for x
    x = 3,533,889,807.07/64,721
  6. Step 6: Final answer
    x = 54,601.90

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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.