Home / 21,189.94-29,238.87-12,690.07

Finding the Fourth Proportional to 21,189.94, 29,238.87 and 12,690.07

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Solution

The fourth proportional to 21,189.94, 29,238.87 and 12,690.07 is: 17,510.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,189.94 : 29,238.87 = 12,690.07 : x
  2. Step 2: Convert to fraction form
    21,189.94/29,238.87 = 12,690.07/x
  3. Step 3: Cross multiply
    21,189.94x = 29,238.87 × 12,690.07
  4. Step 4: Simplify right side
    21,189.94x = 371,043,307.02
  5. Step 5: Solve for x
    x = 371,043,307.02/21,189.94
  6. Step 6: Final answer
    x = 17,510.35

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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.