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Finding the Fourth Proportional to 21,323.70, 31,985.55 and 19,509.30

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Solution

The fourth proportional to 21,323.70, 31,985.55 and 19,509.30 is: 29,263.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,323.70 : 31,985.55 = 19,509.30 : x
  2. Step 2: Convert to fraction form
    21,323.70/31,985.55 = 19,509.30/x
  3. Step 3: Cross multiply
    21,323.70x = 31,985.55 × 19,509.30
  4. Step 4: Simplify right side
    21,323.70x = 624,015,690.62
  5. Step 5: Solve for x
    x = 624,015,690.62/21,323.70
  6. Step 6: Final answer
    x = 29,263.95

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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.