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Finding the Fourth Proportional to 21,707.78, 29,928.01 and 15,652.95

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Solution

The fourth proportional to 21,707.78, 29,928.01 and 15,652.95 is: 21,580.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,707.78 : 29,928.01 = 15,652.95 : x
  2. Step 2: Convert to fraction form
    21,707.78/29,928.01 = 15,652.95/x
  3. Step 3: Cross multiply
    21,707.78x = 29,928.01 × 15,652.95
  4. Step 4: Simplify right side
    21,707.78x = 468,461,644.13
  5. Step 5: Solve for x
    x = 468,461,644.13/21,707.78
  6. Step 6: Final answer
    x = 21,580.36

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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.