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Finding the Fourth Proportional to 61,389.88, 91,636.64 and 52,680.76

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Solution

The fourth proportional to 61,389.88, 91,636.64 and 52,680.76 is: 78,636.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,389.88 : 91,636.64 = 52,680.76 : x
  2. Step 2: Convert to fraction form
    61,389.88/91,636.64 = 52,680.76/x
  3. Step 3: Cross multiply
    61,389.88x = 91,636.64 × 52,680.76
  4. Step 4: Simplify right side
    61,389.88x = 4,827,487,839.05
  5. Step 5: Solve for x
    x = 4,827,487,839.05/61,389.88
  6. Step 6: Final answer
    x = 78,636.54

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.