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Finding the Fourth Proportional to 15,680.70, 21,649.50 and 9,718.70

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Solution

The fourth proportional to 15,680.70, 21,649.50 and 9,718.70 is: 13,418.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,680.70 : 21,649.50 = 9,718.70 : x
  2. Step 2: Convert to fraction form
    15,680.70/21,649.50 = 9,718.70/x
  3. Step 3: Cross multiply
    15,680.70x = 21,649.50 × 9,718.70
  4. Step 4: Simplify right side
    15,680.70x = 210,404,887.40
  5. Step 5: Solve for x
    x = 210,404,887.40/15,680.70
  6. Step 6: Final answer
    x = 13,418.08

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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.