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Finding the Fourth Proportional to 84,020.76, 115,870.68 and 61,323.80

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Solution

The fourth proportional to 84,020.76, 115,870.68 and 61,323.80 is: 84,569.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,020.76 : 115,870.68 = 61,323.80 : x
  2. Step 2: Convert to fraction form
    84,020.76/115,870.68 = 61,323.80/x
  3. Step 3: Cross multiply
    84,020.76x = 115,870.68 × 61,323.80
  4. Step 4: Simplify right side
    84,020.76x = 7,105,629,826.83
  5. Step 5: Solve for x
    x = 7,105,629,826.83/84,020.76
  6. Step 6: Final answer
    x = 84,569.93

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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.