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Finding the Fourth Proportional to 285,467.50, 428,184.78 and 85,783.60

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Solution

The fourth proportional to 285,467.50, 428,184.78 and 85,783.60 is: 128,670.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,467.50 : 428,184.78 = 85,783.60 : x
  2. Step 2: Convert to fraction form
    285,467.50/428,184.78 = 85,783.60/x
  3. Step 3: Cross multiply
    285,467.50x = 428,184.78 × 85,783.60
  4. Step 4: Simplify right side
    285,467.50x = 36,731,231,893.61
  5. Step 5: Solve for x
    x = 36,731,231,893.61/285,467.50
  6. Step 6: Final answer
    x = 128,670.45

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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.