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Finding the Fourth Proportional to 64,980.90, 89,681.41 and 39,491.42

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Solution

The fourth proportional to 64,980.90, 89,681.41 and 39,491.42 is: 54,502.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,980.90 : 89,681.41 = 39,491.42 : x
  2. Step 2: Convert to fraction form
    64,980.90/89,681.41 = 39,491.42/x
  3. Step 3: Cross multiply
    64,980.90x = 89,681.41 × 39,491.42
  4. Step 4: Simplify right side
    64,980.90x = 3,541,645,829.46
  5. Step 5: Solve for x
    x = 3,541,645,829.46/64,980.90
  6. Step 6: Final answer
    x = 54,502.87

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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.