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Finding the Fourth Proportional to 14,957.80, 20,643.30 and 8,991.40

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Solution

The fourth proportional to 14,957.80, 20,643.30 and 8,991.40 is: 12,409.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,957.80 : 20,643.30 = 8,991.40 : x
  2. Step 2: Convert to fraction form
    14,957.80/20,643.30 = 8,991.40/x
  3. Step 3: Cross multiply
    14,957.80x = 20,643.30 × 8,991.40
  4. Step 4: Simplify right side
    14,957.80x = 185,612,167.62
  5. Step 5: Solve for x
    x = 185,612,167.62/14,957.80
  6. Step 6: Final answer
    x = 12,409.06

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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.