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Finding the Fourth Proportional to 78,759.70, 108,686.94 and 42,948.94

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Solution

The fourth proportional to 78,759.70, 108,686.94 and 42,948.94 is: 59,268.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,759.70 : 108,686.94 = 42,948.94 : x
  2. Step 2: Convert to fraction form
    78,759.70/108,686.94 = 42,948.94/x
  3. Step 3: Cross multiply
    78,759.70x = 108,686.94 × 42,948.94
  4. Step 4: Simplify right side
    78,759.70x = 4,667,988,864.84
  5. Step 5: Solve for x
    x = 4,667,988,864.84/78,759.70
  6. Step 6: Final answer
    x = 59,268.75

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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.