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Finding the Fourth Proportional to 31,474.40, 43,411.84 and 21,385.20

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Solution

The fourth proportional to 31,474.40, 43,411.84 and 21,385.20 is: 29,496.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,474.40 : 43,411.84 = 21,385.20 : x
  2. Step 2: Convert to fraction form
    31,474.40/43,411.84 = 21,385.20/x
  3. Step 3: Cross multiply
    31,474.40x = 43,411.84 × 21,385.20
  4. Step 4: Simplify right side
    31,474.40x = 928,370,880.77
  5. Step 5: Solve for x
    x = 928,370,880.77/31,474.40
  6. Step 6: Final answer
    x = 29,496.06

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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.