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Finding the Fourth Proportional to 31,510.80, 43,490.70 and 19,571.40

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Solution

The fourth proportional to 31,510.80, 43,490.70 and 19,571.40 is: 27,012.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,510.80 : 43,490.70 = 19,571.40 : x
  2. Step 2: Convert to fraction form
    31,510.80/43,490.70 = 19,571.40/x
  3. Step 3: Cross multiply
    31,510.80x = 43,490.70 × 19,571.40
  4. Step 4: Simplify right side
    31,510.80x = 851,173,885.98
  5. Step 5: Solve for x
    x = 851,173,885.98/31,510.80
  6. Step 6: Final answer
    x = 27,012.13

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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.