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Finding the Fourth Proportional to 77,387.76, 116,081.79 and 21,228.39

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Solution

The fourth proportional to 77,387.76, 116,081.79 and 21,228.39 is: 31,842.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,387.76 : 116,081.79 = 21,228.39 : x
  2. Step 2: Convert to fraction form
    77,387.76/116,081.79 = 21,228.39/x
  3. Step 3: Cross multiply
    77,387.76x = 116,081.79 × 21,228.39
  4. Step 4: Simplify right side
    77,387.76x = 2,464,229,510.02
  5. Step 5: Solve for x
    x = 2,464,229,510.02/77,387.76
  6. Step 6: Final answer
    x = 31,842.63

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1.5x scale

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.