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Finding the Fourth Proportional to 12,419.70, 17,139.16 and 6,830.70

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Solution

The fourth proportional to 12,419.70, 17,139.16 and 6,830.70 is: 9,426.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,419.70 : 17,139.16 = 6,830.70 : x
  2. Step 2: Convert to fraction form
    12,419.70/17,139.16 = 6,830.70/x
  3. Step 3: Cross multiply
    12,419.70x = 17,139.16 × 6,830.70
  4. Step 4: Simplify right side
    12,419.70x = 117,072,460.21
  5. Step 5: Solve for x
    x = 117,072,460.21/12,419.70
  6. Step 6: Final answer
    x = 9,426.35

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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.