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Finding the Fourth Proportional to 60,516.98, 90,777.90 and 21,078.08

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Solution

The fourth proportional to 60,516.98, 90,777.90 and 21,078.08 is: 31,617.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,516.98 : 90,777.90 = 21,078.08 : x
  2. Step 2: Convert to fraction form
    60,516.98/90,777.90 = 21,078.08/x
  3. Step 3: Cross multiply
    60,516.98x = 90,777.90 × 21,078.08
  4. Step 4: Simplify right side
    60,516.98x = 1,913,423,838.43
  5. Step 5: Solve for x
    x = 1,913,423,838.43/60,516.98
  6. Step 6: Final answer
    x = 31,617.97

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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.