Home / 21,121.77-29,146.07-12,622.20

Finding the Fourth Proportional to 21,121.77, 29,146.07 and 12,622.20

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Solution

The fourth proportional to 21,121.77, 29,146.07 and 12,622.20 is: 17,417.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,121.77 : 29,146.07 = 12,622.20 : x
  2. Step 2: Convert to fraction form
    21,121.77/29,146.07 = 12,622.20/x
  3. Step 3: Cross multiply
    21,121.77x = 29,146.07 × 12,622.20
  4. Step 4: Simplify right side
    21,121.77x = 367,887,461.64
  5. Step 5: Solve for x
    x = 367,887,461.64/21,121.77
  6. Step 6: Final answer
    x = 17,417.45

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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.