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Finding the Fourth Proportional to 71,490.16, 98,668.32 and 39,669.36

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Solution

The fourth proportional to 71,490.16, 98,668.32 and 39,669.36 is: 54,750.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,490.16 : 98,668.32 = 39,669.36 : x
  2. Step 2: Convert to fraction form
    71,490.16/98,668.32 = 39,669.36/x
  3. Step 3: Cross multiply
    71,490.16x = 98,668.32 × 39,669.36
  4. Step 4: Simplify right side
    71,490.16x = 3,914,109,106.68
  5. Step 5: Solve for x
    x = 3,914,109,106.68/71,490.16
  6. Step 6: Final answer
    x = 54,750.32

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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.