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Finding the Fourth Proportional to 8,985.44, 12,398.84 and 5,156.88

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Solution

The fourth proportional to 8,985.44, 12,398.84 and 5,156.88 is: 7,115.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,985.44 : 12,398.84 = 5,156.88 : x
  2. Step 2: Convert to fraction form
    8,985.44/12,398.84 = 5,156.88/x
  3. Step 3: Cross multiply
    8,985.44x = 12,398.84 × 5,156.88
  4. Step 4: Simplify right side
    8,985.44x = 63,939,304.23
  5. Step 5: Solve for x
    x = 63,939,304.23/8,985.44
  6. Step 6: Final answer
    x = 7,115.88

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.