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Finding the Fourth Proportional to 61,320.80, 91,981.20 and 51,406.40

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Solution

The fourth proportional to 61,320.80, 91,981.20 and 51,406.40 is: 77,109.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,320.80 : 91,981.20 = 51,406.40 : x
  2. Step 2: Convert to fraction form
    61,320.80/91,981.20 = 51,406.40/x
  3. Step 3: Cross multiply
    61,320.80x = 91,981.20 × 51,406.40
  4. Step 4: Simplify right side
    61,320.80x = 4,728,422,359.68
  5. Step 5: Solve for x
    x = 4,728,422,359.68/61,320.80
  6. Step 6: Final answer
    x = 77,109.60

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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.