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Finding the Fourth Proportional to 21,777.61, 30,064.20 and 15,409.19

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Solution

The fourth proportional to 21,777.61, 30,064.20 and 15,409.19 is: 21,272.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,777.61 : 30,064.20 = 15,409.19 : x
  2. Step 2: Convert to fraction form
    21,777.61/30,064.20 = 15,409.19/x
  3. Step 3: Cross multiply
    21,777.61x = 30,064.20 × 15,409.19
  4. Step 4: Simplify right side
    21,777.61x = 463,264,819.68
  5. Step 5: Solve for x
    x = 463,264,819.68/21,777.61
  6. Step 6: Final answer
    x = 21,272.53

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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.