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Finding the Fourth Proportional to 86,668, 130,002 and 21,004

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Solution

The fourth proportional to 86,668, 130,002 and 21,004 is: 31,506

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,668 : 130,002 = 21,004 : x
  2. Step 2: Convert to fraction form
    86,668/130,002 = 21,004/x
  3. Step 3: Cross multiply
    86,668x = 130,002 × 21,004
  4. Step 4: Simplify right side
    86,668x = 2,730,562,008
  5. Step 5: Solve for x
    x = 2,730,562,008/86,668
  6. Step 6: Final answer
    x = 31,506

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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.