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Finding the Fourth Proportional to 40,639.70, 60,978.72 and 14,356.82

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Solution

The fourth proportional to 40,639.70, 60,978.72 and 14,356.82 is: 21,542.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,639.70 : 60,978.72 = 14,356.82 : x
  2. Step 2: Convert to fraction form
    40,639.70/60,978.72 = 14,356.82/x
  3. Step 3: Cross multiply
    40,639.70x = 60,978.72 × 14,356.82
  4. Step 4: Simplify right side
    40,639.70x = 875,460,506.87
  5. Step 5: Solve for x
    x = 875,460,506.87/40,639.70
  6. Step 6: Final answer
    x = 21,542.00

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.