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Finding the Fourth Proportional to 21,903.40, 32,903.70 and 21,017.80

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Solution

The fourth proportional to 21,903.40, 32,903.70 and 21,017.80 is: 31,573.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,903.40 : 32,903.70 = 21,017.80 : x
  2. Step 2: Convert to fraction form
    21,903.40/32,903.70 = 21,017.80/x
  3. Step 3: Cross multiply
    21,903.40x = 32,903.70 × 21,017.80
  4. Step 4: Simplify right side
    21,903.40x = 691,563,385.86
  5. Step 5: Solve for x
    x = 691,563,385.86/21,903.40
  6. Step 6: Final answer
    x = 31,573.34

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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.