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Finding the Fourth Proportional to 64,785.65, 89,420.90 and 42,181.11

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Solution

The fourth proportional to 64,785.65, 89,420.90 and 42,181.11 is: 58,220.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,785.65 : 89,420.90 = 42,181.11 : x
  2. Step 2: Convert to fraction form
    64,785.65/89,420.90 = 42,181.11/x
  3. Step 3: Cross multiply
    64,785.65x = 89,420.90 × 42,181.11
  4. Step 4: Simplify right side
    64,785.65x = 3,771,872,608.29
  5. Step 5: Solve for x
    x = 3,771,872,608.29/64,785.65
  6. Step 6: Final answer
    x = 58,220.81

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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.