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Finding the Fourth Proportional to 21,470.40, 32,220.72 and 19,634.40

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Solution

The fourth proportional to 21,470.40, 32,220.72 and 19,634.40 is: 29,465.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,470.40 : 32,220.72 = 19,634.40 : x
  2. Step 2: Convert to fraction form
    21,470.40/32,220.72 = 19,634.40/x
  3. Step 3: Cross multiply
    21,470.40x = 32,220.72 × 19,634.40
  4. Step 4: Simplify right side
    21,470.40x = 632,634,504.77
  5. Step 5: Solve for x
    x = 632,634,504.77/21,470.40
  6. Step 6: Final answer
    x = 29,465.43

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.