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Finding the Fourth Proportional to 285,433.50, 428,133.78 and 85,749.60

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Solution

The fourth proportional to 285,433.50, 428,133.78 and 85,749.60 is: 128,619.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,433.50 : 428,133.78 = 85,749.60 : x
  2. Step 2: Convert to fraction form
    285,433.50/428,133.78 = 85,749.60/x
  3. Step 3: Cross multiply
    285,433.50x = 428,133.78 × 85,749.60
  4. Step 4: Simplify right side
    285,433.50x = 36,712,300,381.49
  5. Step 5: Solve for x
    x = 36,712,300,381.49/285,433.50
  6. Step 6: Final answer
    x = 128,619.45

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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.