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Finding the Fourth Proportional to 29,028, 40,058.96 and 15,780

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Solution

The fourth proportional to 29,028, 40,058.96 and 15,780 is: 21,776.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    29,028 : 40,058.96 = 15,780 : x
  2. Step 2: Convert to fraction form
    29,028/40,058.96 = 15,780/x
  3. Step 3: Cross multiply
    29,028x = 40,058.96 × 15,780
  4. Step 4: Simplify right side
    29,028x = 632,130,388.80
  5. Step 5: Solve for x
    x = 632,130,388.80/29,028
  6. Step 6: Final answer
    x = 21,776.57

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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.