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Finding the Fourth Proportional to 285,315.58, 427,981.15 and 85,635.97

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Solution

The fourth proportional to 285,315.58, 427,981.15 and 85,635.97 is: 128,456.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,315.58 : 427,981.15 = 85,635.97 : x
  2. Step 2: Convert to fraction form
    285,315.58/427,981.15 = 85,635.97/x
  3. Step 3: Cross multiply
    285,315.58x = 427,981.15 × 85,635.97
  4. Step 4: Simplify right side
    285,315.58x = 36,650,579,959.06
  5. Step 5: Solve for x
    x = 36,650,579,959.06/285,315.58
  6. Step 6: Final answer
    x = 128,456.29

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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.