Home / 30,787.98-42,424.64-21,230.78

Finding the Fourth Proportional to 30,787.98, 42,424.64 and 21,230.78

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Solution

The fourth proportional to 30,787.98, 42,424.64 and 21,230.78 is: 29,255.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,787.98 : 42,424.64 = 21,230.78 : x
  2. Step 2: Convert to fraction form
    30,787.98/42,424.64 = 21,230.78/x
  3. Step 3: Cross multiply
    30,787.98x = 42,424.64 × 21,230.78
  4. Step 4: Simplify right side
    30,787.98x = 900,708,198.42
  5. Step 5: Solve for x
    x = 900,708,198.42/30,787.98
  6. Step 6: Final answer
    x = 29,255.19

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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.