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Finding the Fourth Proportional to 21,130.84, 31,671.42 and 8,643.07

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Solution

The fourth proportional to 21,130.84, 31,671.42 and 8,643.07 is: 12,954.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,130.84 : 31,671.42 = 8,643.07 : x
  2. Step 2: Convert to fraction form
    21,130.84/31,671.42 = 8,643.07/x
  3. Step 3: Cross multiply
    21,130.84x = 31,671.42 × 8,643.07
  4. Step 4: Simplify right side
    21,130.84x = 273,738,300.06
  5. Step 5: Solve for x
    x = 273,738,300.06/21,130.84
  6. Step 6: Final answer
    x = 12,954.44

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.