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Finding the Fourth Proportional to 21,261.70, 31,892.85 and 7,410.70

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Solution

The fourth proportional to 21,261.70, 31,892.85 and 7,410.70 is: 11,116.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,261.70 : 31,892.85 = 7,410.70 : x
  2. Step 2: Convert to fraction form
    21,261.70/31,892.85 = 7,410.70/x
  3. Step 3: Cross multiply
    21,261.70x = 31,892.85 × 7,410.70
  4. Step 4: Simplify right side
    21,261.70x = 236,348,263.76
  5. Step 5: Solve for x
    x = 236,348,263.76/21,261.70
  6. Step 6: Final answer
    x = 11,116.15

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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.