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Finding the Fourth Proportional to 77,060, 115,590 and 21,656

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Solution

The fourth proportional to 77,060, 115,590 and 21,656 is: 32,484

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,060 : 115,590 = 21,656 : x
  2. Step 2: Convert to fraction form
    77,060/115,590 = 21,656/x
  3. Step 3: Cross multiply
    77,060x = 115,590 × 21,656
  4. Step 4: Simplify right side
    77,060x = 2,503,217,040
  5. Step 5: Solve for x
    x = 2,503,217,040/77,060
  6. Step 6: Final answer
    x = 32,484

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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.