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Finding the Fourth Proportional to 210,031.20, 315,046.80 and 76,915.80

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Solution

The fourth proportional to 210,031.20, 315,046.80 and 76,915.80 is: 115,373.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,031.20 : 315,046.80 = 76,915.80 : x
  2. Step 2: Convert to fraction form
    210,031.20/315,046.80 = 76,915.80/x
  3. Step 3: Cross multiply
    210,031.20x = 315,046.80 × 76,915.80
  4. Step 4: Simplify right side
    210,031.20x = 24,232,076,659.44
  5. Step 5: Solve for x
    x = 24,232,076,659.44/210,031.20
  6. Step 6: Final answer
    x = 115,373.70

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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.