Home / 15,787.49-21,815.55-13,518.41

Finding the Fourth Proportional to 15,787.49, 21,815.55 and 13,518.41

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Solution

The fourth proportional to 15,787.49, 21,815.55 and 13,518.41 is: 18,680.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,787.49 : 21,815.55 = 13,518.41 : x
  2. Step 2: Convert to fraction form
    15,787.49/21,815.55 = 13,518.41/x
  3. Step 3: Cross multiply
    15,787.49x = 21,815.55 × 13,518.41
  4. Step 4: Simplify right side
    15,787.49x = 294,911,440.20
  5. Step 5: Solve for x
    x = 294,911,440.20/15,787.49
  6. Step 6: Final answer
    x = 18,680.08

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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.