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Finding the Fourth Proportional to 39,762.76, 54,872.72 and 21,859.60

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Solution

The fourth proportional to 39,762.76, 54,872.72 and 21,859.60 is: 30,166.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,762.76 : 54,872.72 = 21,859.60 : x
  2. Step 2: Convert to fraction form
    39,762.76/54,872.72 = 21,859.60/x
  3. Step 3: Cross multiply
    39,762.76x = 54,872.72 × 21,859.60
  4. Step 4: Simplify right side
    39,762.76x = 1,199,495,710.11
  5. Step 5: Solve for x
    x = 1,199,495,710.11/39,762.76
  6. Step 6: Final answer
    x = 30,166.31

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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.