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Finding the Fourth Proportional to 285,555.88, 428,395.10 and 85,859.56

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Solution

The fourth proportional to 285,555.88, 428,395.10 and 85,859.56 is: 128,807.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,555.88 : 428,395.10 = 85,859.56 : x
  2. Step 2: Convert to fraction form
    285,555.88/428,395.10 = 85,859.56/x
  3. Step 3: Cross multiply
    285,555.88x = 428,395.10 × 85,859.56
  4. Step 4: Simplify right side
    285,555.88x = 36,781,814,792.16
  5. Step 5: Solve for x
    x = 36,781,814,792.16/285,555.88
  6. Step 6: Final answer
    x = 128,807.77

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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.