Home / 21,130.40-29,150.80-12,742.08

Finding the Fourth Proportional to 21,130.40, 29,150.80 and 12,742.08

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Solution

The fourth proportional to 21,130.40, 29,150.80 and 12,742.08 is: 17,578.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,130.40 : 29,150.80 = 12,742.08 : x
  2. Step 2: Convert to fraction form
    21,130.40/29,150.80 = 12,742.08/x
  3. Step 3: Cross multiply
    21,130.40x = 29,150.80 × 12,742.08
  4. Step 4: Simplify right side
    21,130.40x = 371,441,825.66
  5. Step 5: Solve for x
    x = 371,441,825.66/21,130.40
  6. Step 6: Final answer
    x = 17,578.55

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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.