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Finding the Fourth Proportional to 86,900, 130,350 and 21,236

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Solution

The fourth proportional to 86,900, 130,350 and 21,236 is: 31,854

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,900 : 130,350 = 21,236 : x
  2. Step 2: Convert to fraction form
    86,900/130,350 = 21,236/x
  3. Step 3: Cross multiply
    86,900x = 130,350 × 21,236
  4. Step 4: Simplify right side
    86,900x = 2,768,112,600
  5. Step 5: Solve for x
    x = 2,768,112,600/86,900
  6. Step 6: Final answer
    x = 31,854

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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.