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Finding the Fourth Proportional to 28,409.98, 39,206.70 and 15,663.70

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Solution

The fourth proportional to 28,409.98, 39,206.70 and 15,663.70 is: 21,616.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,409.98 : 39,206.70 = 15,663.70 : x
  2. Step 2: Convert to fraction form
    28,409.98/39,206.70 = 15,663.70/x
  3. Step 3: Cross multiply
    28,409.98x = 39,206.70 × 15,663.70
  4. Step 4: Simplify right side
    28,409.98x = 614,121,986.79
  5. Step 5: Solve for x
    x = 614,121,986.79/28,409.98
  6. Step 6: Final answer
    x = 21,616.42

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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.