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Finding the Fourth Proportional to 19,079.76, 28,630.78 and 7,985.48

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Solution

The fourth proportional to 19,079.76, 28,630.78 and 7,985.48 is: 11,982.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,079.76 : 28,630.78 = 7,985.48 : x
  2. Step 2: Convert to fraction form
    19,079.76/28,630.78 = 7,985.48/x
  3. Step 3: Cross multiply
    19,079.76x = 28,630.78 × 7,985.48
  4. Step 4: Simplify right side
    19,079.76x = 228,630,521.07
  5. Step 5: Solve for x
    x = 228,630,521.07/19,079.76
  6. Step 6: Final answer
    x = 11,982.88

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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.