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Finding the Fourth Proportional to 21,665.28, 29,835.20 and 19,280.64

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Solution

The fourth proportional to 21,665.28, 29,835.20 and 19,280.64 is: 26,551.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,665.28 : 29,835.20 = 19,280.64 : x
  2. Step 2: Convert to fraction form
    21,665.28/29,835.20 = 19,280.64/x
  3. Step 3: Cross multiply
    21,665.28x = 29,835.20 × 19,280.64
  4. Step 4: Simplify right side
    21,665.28x = 575,241,750.53
  5. Step 5: Solve for x
    x = 575,241,750.53/21,665.28
  6. Step 6: Final answer
    x = 26,551.32

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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.