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Finding the Fourth Proportional to 20,653.80, 28,502.40 and 11,222.40

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Solution

The fourth proportional to 20,653.80, 28,502.40 and 11,222.40 is: 15,487.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,653.80 : 28,502.40 = 11,222.40 : x
  2. Step 2: Convert to fraction form
    20,653.80/28,502.40 = 11,222.40/x
  3. Step 3: Cross multiply
    20,653.80x = 28,502.40 × 11,222.40
  4. Step 4: Simplify right side
    20,653.80x = 319,865,333.76
  5. Step 5: Solve for x
    x = 319,865,333.76/20,653.80
  6. Step 6: Final answer
    x = 15,487.00

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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.