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Finding the Fourth Proportional to 28,071.78, 42,071.10 and 11,412.37

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Solution

The fourth proportional to 28,071.78, 42,071.10 and 11,412.37 is: 17,103.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,071.78 : 42,071.10 = 11,412.37 : x
  2. Step 2: Convert to fraction form
    28,071.78/42,071.10 = 11,412.37/x
  3. Step 3: Cross multiply
    28,071.78x = 42,071.10 × 11,412.37
  4. Step 4: Simplify right side
    28,071.78x = 480,130,959.51
  5. Step 5: Solve for x
    x = 480,130,959.51/28,071.78
  6. Step 6: Final answer
    x = 17,103.69

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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.