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Finding the Fourth Proportional to 29,220, 40,323.60 and 15,972

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Solution

The fourth proportional to 29,220, 40,323.60 and 15,972 is: 22,041.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    29,220 : 40,323.60 = 15,972 : x
  2. Step 2: Convert to fraction form
    29,220/40,323.60 = 15,972/x
  3. Step 3: Cross multiply
    29,220x = 40,323.60 × 15,972
  4. Step 4: Simplify right side
    29,220x = 644,048,539.20
  5. Step 5: Solve for x
    x = 644,048,539.20/29,220
  6. Step 6: Final answer
    x = 22,041.36

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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.