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Finding the Fourth Proportional to 285,936.80, 428,908.28 and 86,258.90

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Solution

The fourth proportional to 285,936.80, 428,908.28 and 86,258.90 is: 129,389.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,936.80 : 428,908.28 = 86,258.90 : x
  2. Step 2: Convert to fraction form
    285,936.80/428,908.28 = 86,258.90/x
  3. Step 3: Cross multiply
    285,936.80x = 428,908.28 × 86,258.90
  4. Step 4: Simplify right side
    285,936.80x = 36,997,156,433.69
  5. Step 5: Solve for x
    x = 36,997,156,433.69/285,936.80
  6. Step 6: Final answer
    x = 129,389.28

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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.