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Finding the Fourth Proportional to 30,918.47, 42,620.15 and 18,959.63

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Solution

The fourth proportional to 30,918.47, 42,620.15 and 18,959.63 is: 26,135.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,918.47 : 42,620.15 = 18,959.63 : x
  2. Step 2: Convert to fraction form
    30,918.47/42,620.15 = 18,959.63/x
  3. Step 3: Cross multiply
    30,918.47x = 42,620.15 × 18,959.63
  4. Step 4: Simplify right side
    30,918.47x = 808,062,179.75
  5. Step 5: Solve for x
    x = 808,062,179.75/30,918.47
  6. Step 6: Final answer
    x = 26,135.26

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1.5x scale

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.