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Finding the Fourth Proportional to 64,681, 89,264.91 and 36,388.78

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Solution

The fourth proportional to 64,681, 89,264.91 and 36,388.78 is: 50,219.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,681 : 89,264.91 = 36,388.78 : x
  2. Step 2: Convert to fraction form
    64,681/89,264.91 = 36,388.78/x
  3. Step 3: Cross multiply
    64,681x = 89,264.91 × 36,388.78
  4. Step 4: Simplify right side
    64,681x = 3,248,241,171.71
  5. Step 5: Solve for x
    x = 3,248,241,171.71/64,681
  6. Step 6: Final answer
    x = 50,219.40

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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.