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Finding the Fourth Proportional to 8,421.98, 11,615.51 and 7,411.51

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Solution

The fourth proportional to 8,421.98, 11,615.51 and 7,411.51 is: 10,221.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,421.98 : 11,615.51 = 7,411.51 : x
  2. Step 2: Convert to fraction form
    8,421.98/11,615.51 = 7,411.51/x
  3. Step 3: Cross multiply
    8,421.98x = 11,615.51 × 7,411.51
  4. Step 4: Simplify right side
    8,421.98x = 86,088,468.52
  5. Step 5: Solve for x
    x = 86,088,468.52/8,421.98
  6. Step 6: Final answer
    x = 10,221.88

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Double scale
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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.