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Finding the Fourth Proportional to 285,611.20, 428,007.20 and 210,142.40

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Solution

The fourth proportional to 285,611.20, 428,007.20 and 210,142.40 is: 314,912.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,611.20 : 428,007.20 = 210,142.40 : x
  2. Step 2: Convert to fraction form
    285,611.20/428,007.20 = 210,142.40/x
  3. Step 3: Cross multiply
    285,611.20x = 428,007.20 × 210,142.40
  4. Step 4: Simplify right side
    285,611.20x = 89,942,460,225.28
  5. Step 5: Solve for x
    x = 89,942,460,225.28/285,611.20
  6. Step 6: Final answer
    x = 314,912.23

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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.