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Finding the Fourth Proportional to 21,503.80, 32,255.70 and 19,430.20

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Solution

The fourth proportional to 21,503.80, 32,255.70 and 19,430.20 is: 29,145.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,503.80 : 32,255.70 = 19,430.20 : x
  2. Step 2: Convert to fraction form
    21,503.80/32,255.70 = 19,430.20/x
  3. Step 3: Cross multiply
    21,503.80x = 32,255.70 × 19,430.20
  4. Step 4: Simplify right side
    21,503.80x = 626,734,702.14
  5. Step 5: Solve for x
    x = 626,734,702.14/21,503.80
  6. Step 6: Final answer
    x = 29,145.30

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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.