Home / 15,787.32-21,788.90-9,820.91

Finding the Fourth Proportional to 15,787.32, 21,788.90 and 9,820.91

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Solution

The fourth proportional to 15,787.32, 21,788.90 and 9,820.91 is: 13,554.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,787.32 : 21,788.90 = 9,820.91 : x
  2. Step 2: Convert to fraction form
    15,787.32/21,788.90 = 9,820.91/x
  3. Step 3: Cross multiply
    15,787.32x = 21,788.90 × 9,820.91
  4. Step 4: Simplify right side
    15,787.32x = 213,986,868.10
  5. Step 5: Solve for x
    x = 213,986,868.10/15,787.32
  6. Step 6: Final answer
    x = 13,554.35

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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.