Home / 12,420.05-17,140.64-7,116.57

Finding the Fourth Proportional to 12,420.05, 17,140.64 and 7,116.57

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Solution

The fourth proportional to 12,420.05, 17,140.64 and 7,116.57 is: 9,821.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,420.05 : 17,140.64 = 7,116.57 : x
  2. Step 2: Convert to fraction form
    12,420.05/17,140.64 = 7,116.57/x
  3. Step 3: Cross multiply
    12,420.05x = 17,140.64 × 7,116.57
  4. Step 4: Simplify right side
    12,420.05x = 121,982,564.40
  5. Step 5: Solve for x
    x = 121,982,564.40/12,420.05
  6. Step 6: Final answer
    x = 9,821.42

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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.