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Finding the Fourth Proportional to 285,980.75, 428,973.56 and 72,748.84

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Solution

The fourth proportional to 285,980.75, 428,973.56 and 72,748.84 is: 109,123.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,980.75 : 428,973.56 = 72,748.84 : x
  2. Step 2: Convert to fraction form
    285,980.75/428,973.56 = 72,748.84/x
  3. Step 3: Cross multiply
    285,980.75x = 428,973.56 × 72,748.84
  4. Step 4: Simplify right side
    285,980.75x = 31,207,328,880.67
  5. Step 5: Solve for x
    x = 31,207,328,880.67/285,980.75
  6. Step 6: Final answer
    x = 109,123.88

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1.5x scale

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.