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Finding the Fourth Proportional to 12,139.70, 18,210.15 and 6,307.70

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Solution

The fourth proportional to 12,139.70, 18,210.15 and 6,307.70 is: 9,461.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,139.70 : 18,210.15 = 6,307.70 : x
  2. Step 2: Convert to fraction form
    12,139.70/18,210.15 = 6,307.70/x
  3. Step 3: Cross multiply
    12,139.70x = 18,210.15 × 6,307.70
  4. Step 4: Simplify right side
    12,139.70x = 114,864,163.16
  5. Step 5: Solve for x
    x = 114,864,163.16/12,139.70
  6. Step 6: Final answer
    x = 9,461.86

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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.