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Finding the Fourth Proportional to 76,785.74, 105,915.80 and 52,870.88

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Solution

The fourth proportional to 76,785.74, 105,915.80 and 52,870.88 is: 72,928.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,785.74 : 105,915.80 = 52,870.88 : x
  2. Step 2: Convert to fraction form
    76,785.74/105,915.80 = 52,870.88/x
  3. Step 3: Cross multiply
    76,785.74x = 105,915.80 × 52,870.88
  4. Step 4: Simplify right side
    76,785.74x = 5,599,861,551.90
  5. Step 5: Solve for x
    x = 5,599,861,551.90/76,785.74
  6. Step 6: Final answer
    x = 72,928.41

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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.