Home / 20,639.47-28,483.45-11,686.78

Finding the Fourth Proportional to 20,639.47, 28,483.45 and 11,686.78

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Solution

The fourth proportional to 20,639.47, 28,483.45 and 11,686.78 is: 16,128.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,639.47 : 28,483.45 = 11,686.78 : x
  2. Step 2: Convert to fraction form
    20,639.47/28,483.45 = 11,686.78/x
  3. Step 3: Cross multiply
    20,639.47x = 28,483.45 × 11,686.78
  4. Step 4: Simplify right side
    20,639.47x = 332,879,894.13
  5. Step 5: Solve for x
    x = 332,879,894.13/20,639.47
  6. Step 6: Final answer
    x = 16,128.32

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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.