Home / 15,788.78-21,787.64-9,069.70

Finding the Fourth Proportional to 15,788.78, 21,787.64 and 9,069.70

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Solution

The fourth proportional to 15,788.78, 21,787.64 and 9,069.70 is: 12,515.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,788.78 : 21,787.64 = 9,069.70 : x
  2. Step 2: Convert to fraction form
    15,788.78/21,787.64 = 9,069.70/x
  3. Step 3: Cross multiply
    15,788.78x = 21,787.64 × 9,069.70
  4. Step 4: Simplify right side
    15,788.78x = 197,607,358.51
  5. Step 5: Solve for x
    x = 197,607,358.51/15,788.78
  6. Step 6: Final answer
    x = 12,515.68

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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.