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Finding the Fourth Proportional to 28,011.78, 42,005.34 and 8,291.88

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Solution

The fourth proportional to 28,011.78, 42,005.34 and 8,291.88 is: 12,434.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,011.78 : 42,005.34 = 8,291.88 : x
  2. Step 2: Convert to fraction form
    28,011.78/42,005.34 = 8,291.88/x
  3. Step 3: Cross multiply
    28,011.78x = 42,005.34 × 8,291.88
  4. Step 4: Simplify right side
    28,011.78x = 348,303,238.64
  5. Step 5: Solve for x
    x = 348,303,238.64/28,011.78
  6. Step 6: Final answer
    x = 12,434.17

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.