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Finding the Fourth Proportional to 86,668.50, 130,002.75 and 21,004.50

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Solution

The fourth proportional to 86,668.50, 130,002.75 and 21,004.50 is: 31,506.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,668.50 : 130,002.75 = 21,004.50 : x
  2. Step 2: Convert to fraction form
    86,668.50/130,002.75 = 21,004.50/x
  3. Step 3: Cross multiply
    86,668.50x = 130,002.75 × 21,004.50
  4. Step 4: Simplify right side
    86,668.50x = 2,730,642,762.38
  5. Step 5: Solve for x
    x = 2,730,642,762.38/86,668.50
  6. Step 6: Final answer
    x = 31,506.75

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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.