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Finding the Fourth Proportional to 15,682.80, 21,643.40 and 10,368.40

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Solution

The fourth proportional to 15,682.80, 21,643.40 and 10,368.40 is: 14,309.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,682.80 : 21,643.40 = 10,368.40 : x
  2. Step 2: Convert to fraction form
    15,682.80/21,643.40 = 10,368.40/x
  3. Step 3: Cross multiply
    15,682.80x = 21,643.40 × 10,368.40
  4. Step 4: Simplify right side
    15,682.80x = 224,407,428.56
  5. Step 5: Solve for x
    x = 224,407,428.56/15,682.80
  6. Step 6: Final answer
    x = 14,309.14

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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.