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Finding the Fourth Proportional to 285,256.84, 427,859.76 and 85,621.80

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Solution

The fourth proportional to 285,256.84, 427,859.76 and 85,621.80 is: 128,425.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,256.84 : 427,859.76 = 85,621.80 : x
  2. Step 2: Convert to fraction form
    285,256.84/427,859.76 = 85,621.80/x
  3. Step 3: Cross multiply
    285,256.84x = 427,859.76 × 85,621.80
  4. Step 4: Simplify right side
    285,256.84x = 36,634,122,798.77
  5. Step 5: Solve for x
    x = 36,634,122,798.77/285,256.84
  6. Step 6: Final answer
    x = 128,425.05

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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.