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Finding the Fourth Proportional to 28,971.36, 39,990.11 and 17,648.17

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Solution

The fourth proportional to 28,971.36, 39,990.11 and 17,648.17 is: 24,360.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,971.36 : 39,990.11 = 17,648.17 : x
  2. Step 2: Convert to fraction form
    28,971.36/39,990.11 = 17,648.17/x
  3. Step 3: Cross multiply
    28,971.36x = 39,990.11 × 17,648.17
  4. Step 4: Simplify right side
    28,971.36x = 705,752,071.38
  5. Step 5: Solve for x
    x = 705,752,071.38/28,971.36
  6. Step 6: Final answer
    x = 24,360.34

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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.