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Finding the Fourth Proportional to 18,686.70, 28,031.40 and 6,215.40

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Solution

The fourth proportional to 18,686.70, 28,031.40 and 6,215.40 is: 9,323.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,686.70 : 28,031.40 = 6,215.40 : x
  2. Step 2: Convert to fraction form
    18,686.70/28,031.40 = 6,215.40/x
  3. Step 3: Cross multiply
    18,686.70x = 28,031.40 × 6,215.40
  4. Step 4: Simplify right side
    18,686.70x = 174,226,363.56
  5. Step 5: Solve for x
    x = 174,226,363.56/18,686.70
  6. Step 6: Final answer
    x = 9,323.55

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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.