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Finding the Fourth Proportional to 30,803.90, 42,509.81 and 18,862.88

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Solution

The fourth proportional to 30,803.90, 42,509.81 and 18,862.88 is: 26,031.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,803.90 : 42,509.81 = 18,862.88 : x
  2. Step 2: Convert to fraction form
    30,803.90/42,509.81 = 18,862.88/x
  3. Step 3: Cross multiply
    30,803.90x = 42,509.81 × 18,862.88
  4. Step 4: Simplify right side
    30,803.90x = 801,857,279.46
  5. Step 5: Solve for x
    x = 801,857,279.46/30,803.90
  6. Step 6: Final answer
    x = 26,031.04

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.