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Finding the Fourth Proportional to 28,712, 39,621.84 and 15,965.22

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Solution

The fourth proportional to 28,712, 39,621.84 and 15,965.22 is: 22,031.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,712 : 39,621.84 = 15,965.22 : x
  2. Step 2: Convert to fraction form
    28,712/39,621.84 = 15,965.22/x
  3. Step 3: Cross multiply
    28,712x = 39,621.84 × 15,965.22
  4. Step 4: Simplify right side
    28,712x = 632,571,392.40
  5. Step 5: Solve for x
    x = 632,571,392.40/28,712
  6. Step 6: Final answer
    x = 22,031.60

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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.