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Finding the Fourth Proportional to 81,345.69, 121,859.61 and 56,040.74

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Solution

The fourth proportional to 81,345.69, 121,859.61 and 56,040.74 is: 83,951.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,345.69 : 121,859.61 = 56,040.74 : x
  2. Step 2: Convert to fraction form
    81,345.69/121,859.61 = 56,040.74/x
  3. Step 3: Cross multiply
    81,345.69x = 121,859.61 × 56,040.74
  4. Step 4: Simplify right side
    81,345.69x = 6,829,102,111.21
  5. Step 5: Solve for x
    x = 6,829,102,111.21/81,345.69
  6. Step 6: Final answer
    x = 83,951.62

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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.