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Finding the Fourth Proportional to 78,785.61, 108,725.66 and 42,976.92

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Solution

The fourth proportional to 78,785.61, 108,725.66 and 42,976.92 is: 59,308.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,785.61 : 108,725.66 = 42,976.92 : x
  2. Step 2: Convert to fraction form
    78,785.61/108,725.66 = 42,976.92/x
  3. Step 3: Cross multiply
    78,785.61x = 108,725.66 × 42,976.92
  4. Step 4: Simplify right side
    78,785.61x = 4,672,693,991.77
  5. Step 5: Solve for x
    x = 4,672,693,991.77/78,785.61
  6. Step 6: Final answer
    x = 59,308.98

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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.