Home / 15,516.48-21,420-9,930.72

Finding the Fourth Proportional to 15,516.48, 21,420 and 9,930.72

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Solution

The fourth proportional to 15,516.48, 21,420 and 9,930.72 is: 13,709.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,516.48 : 21,420 = 9,930.72 : x
  2. Step 2: Convert to fraction form
    15,516.48/21,420 = 9,930.72/x
  3. Step 3: Cross multiply
    15,516.48x = 21,420 × 9,930.72
  4. Step 4: Simplify right side
    15,516.48x = 212,716,022.40
  5. Step 5: Solve for x
    x = 212,716,022.40/15,516.48
  6. Step 6: Final answer
    x = 13,709.04

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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.