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Finding the Fourth Proportional to 64,630.40, 89,190.56 and 39,479.88

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Solution

The fourth proportional to 64,630.40, 89,190.56 and 39,479.88 is: 54,482.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,630.40 : 89,190.56 = 39,479.88 : x
  2. Step 2: Convert to fraction form
    64,630.40/89,190.56 = 39,479.88/x
  3. Step 3: Cross multiply
    64,630.40x = 89,190.56 × 39,479.88
  4. Step 4: Simplify right side
    64,630.40x = 3,521,232,605.93
  5. Step 5: Solve for x
    x = 3,521,232,605.93/64,630.40
  6. Step 6: Final answer
    x = 54,482.61

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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.