Home / 12,787.64-17,646.38-7,122.20

Finding the Fourth Proportional to 12,787.64, 17,646.38 and 7,122.20

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Solution

The fourth proportional to 12,787.64, 17,646.38 and 7,122.20 is: 9,828.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,787.64 : 17,646.38 = 7,122.20 : x
  2. Step 2: Convert to fraction form
    12,787.64/17,646.38 = 7,122.20/x
  3. Step 3: Cross multiply
    12,787.64x = 17,646.38 × 7,122.20
  4. Step 4: Simplify right side
    12,787.64x = 125,681,047.64
  5. Step 5: Solve for x
    x = 125,681,047.64/12,787.64
  6. Step 6: Final answer
    x = 9,828.32

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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.