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Finding the Fourth Proportional to 38,645, 53,330.74 and 20,981

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Solution

The fourth proportional to 38,645, 53,330.74 and 20,981 is: 28,954.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,645 : 53,330.74 = 20,981 : x
  2. Step 2: Convert to fraction form
    38,645/53,330.74 = 20,981/x
  3. Step 3: Cross multiply
    38,645x = 53,330.74 × 20,981
  4. Step 4: Simplify right side
    38,645x = 1,118,932,255.94
  5. Step 5: Solve for x
    x = 1,118,932,255.94/38,645
  6. Step 6: Final answer
    x = 28,954.13

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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.