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Finding the Fourth Proportional to 21,008.40, 31,514.40 and 6,965.40

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Solution

The fourth proportional to 21,008.40, 31,514.40 and 6,965.40 is: 10,448.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,008.40 : 31,514.40 = 6,965.40 : x
  2. Step 2: Convert to fraction form
    21,008.40/31,514.40 = 6,965.40/x
  3. Step 3: Cross multiply
    21,008.40x = 31,514.40 × 6,965.40
  4. Step 4: Simplify right side
    21,008.40x = 219,510,401.76
  5. Step 5: Solve for x
    x = 219,510,401.76/21,008.40
  6. Step 6: Final answer
    x = 10,448.70

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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.