Home / 13,929.12-19,221.24-7,640.28

Finding the Fourth Proportional to 13,929.12, 19,221.24 and 7,640.28

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Solution

The fourth proportional to 13,929.12, 19,221.24 and 7,640.28 is: 10,543.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,929.12 : 19,221.24 = 7,640.28 : x
  2. Step 2: Convert to fraction form
    13,929.12/19,221.24 = 7,640.28/x
  3. Step 3: Cross multiply
    13,929.12x = 19,221.24 × 7,640.28
  4. Step 4: Simplify right side
    13,929.12x = 146,855,655.55
  5. Step 5: Solve for x
    x = 146,855,655.55/13,929.12
  6. Step 6: Final answer
    x = 10,543.07

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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.