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Finding the Fourth Proportional to 38,635, 53,316.30 and 20,971

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Solution

The fourth proportional to 38,635, 53,316.30 and 20,971 is: 28,939.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,635 : 53,316.30 = 20,971 : x
  2. Step 2: Convert to fraction form
    38,635/53,316.30 = 20,971/x
  3. Step 3: Cross multiply
    38,635x = 53,316.30 × 20,971
  4. Step 4: Simplify right side
    38,635x = 1,118,096,127.30
  5. Step 5: Solve for x
    x = 1,118,096,127.30/38,635
  6. Step 6: Final answer
    x = 28,939.98

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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.