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Finding the Fourth Proportional to 15,572.80, 21,484.96 and 9,986.88

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Solution

The fourth proportional to 15,572.80, 21,484.96 and 9,986.88 is: 13,778.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,572.80 : 21,484.96 = 9,986.88 : x
  2. Step 2: Convert to fraction form
    15,572.80/21,484.96 = 9,986.88/x
  3. Step 3: Cross multiply
    15,572.80x = 21,484.96 × 9,986.88
  4. Step 4: Simplify right side
    15,572.80x = 214,567,717.32
  5. Step 5: Solve for x
    x = 214,567,717.32/15,572.80
  6. Step 6: Final answer
    x = 13,778.36

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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.