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Finding the Fourth Proportional to 21,262, 31,668.40 and 20,151.76

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Solution

The fourth proportional to 21,262, 31,668.40 and 20,151.76 is: 30,014.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,262 : 31,668.40 = 20,151.76 : x
  2. Step 2: Convert to fraction form
    21,262/31,668.40 = 20,151.76/x
  3. Step 3: Cross multiply
    21,262x = 31,668.40 × 20,151.76
  4. Step 4: Simplify right side
    21,262x = 638,173,996.38
  5. Step 5: Solve for x
    x = 638,173,996.38/21,262
  6. Step 6: Final answer
    x = 30,014.77

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.