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Finding the Fourth Proportional to 61,400.80, 84,786.78 and 38,780.20

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Solution

The fourth proportional to 61,400.80, 84,786.78 and 38,780.20 is: 53,550.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,400.80 : 84,786.78 = 38,780.20 : x
  2. Step 2: Convert to fraction form
    61,400.80/84,786.78 = 38,780.20/x
  3. Step 3: Cross multiply
    61,400.80x = 84,786.78 × 38,780.20
  4. Step 4: Simplify right side
    61,400.80x = 3,288,048,285.76
  5. Step 5: Solve for x
    x = 3,288,048,285.76/61,400.80
  6. Step 6: Final answer
    x = 53,550.58

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.