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Finding the Fourth Proportional to 28,574.80, 42,862.20 and 11,929.30

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Solution

The fourth proportional to 28,574.80, 42,862.20 and 11,929.30 is: 17,893.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,574.80 : 42,862.20 = 11,929.30 : x
  2. Step 2: Convert to fraction form
    28,574.80/42,862.20 = 11,929.30/x
  3. Step 3: Cross multiply
    28,574.80x = 42,862.20 × 11,929.30
  4. Step 4: Simplify right side
    28,574.80x = 511,316,042.46
  5. Step 5: Solve for x
    x = 511,316,042.46/28,574.80
  6. Step 6: Final answer
    x = 17,893.95

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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.