Home / 20,640.16-28,483.58-11,208.72

Finding the Fourth Proportional to 20,640.16, 28,483.58 and 11,208.72

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Solution

The fourth proportional to 20,640.16, 28,483.58 and 11,208.72 is: 15,468.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,640.16 : 28,483.58 = 11,208.72 : x
  2. Step 2: Convert to fraction form
    20,640.16/28,483.58 = 11,208.72/x
  3. Step 3: Cross multiply
    20,640.16x = 28,483.58 × 11,208.72
  4. Step 4: Simplify right side
    20,640.16x = 319,264,472.82
  5. Step 5: Solve for x
    x = 319,264,472.82/20,640.16
  6. Step 6: Final answer
    x = 15,468.12

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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.