Home / 20,931.66-28,881.90-15,894.54

Finding the Fourth Proportional to 20,931.66, 28,881.90 and 15,894.54

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Solution

The fourth proportional to 20,931.66, 28,881.90 and 15,894.54 is: 21,931.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,931.66 : 28,881.90 = 15,894.54 : x
  2. Step 2: Convert to fraction form
    20,931.66/28,881.90 = 15,894.54/x
  3. Step 3: Cross multiply
    20,931.66x = 28,881.90 × 15,894.54
  4. Step 4: Simplify right side
    20,931.66x = 459,064,514.83
  5. Step 5: Solve for x
    x = 459,064,514.83/20,931.66
  6. Step 6: Final answer
    x = 21,931.59

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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.