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Finding the Fourth Proportional to 64,790.80, 89,412.78 and 36,113.40

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Solution

The fourth proportional to 64,790.80, 89,412.78 and 36,113.40 is: 49,837.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,790.80 : 89,412.78 = 36,113.40 : x
  2. Step 2: Convert to fraction form
    64,790.80/89,412.78 = 36,113.40/x
  3. Step 3: Cross multiply
    64,790.80x = 89,412.78 × 36,113.40
  4. Step 4: Simplify right side
    64,790.80x = 3,228,999,489.25
  5. Step 5: Solve for x
    x = 3,228,999,489.25/64,790.80
  6. Step 6: Final answer
    x = 49,837.31

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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.