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Finding the Fourth Proportional to 21,955, 30,298.26 and 12,528.76

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Solution

The fourth proportional to 21,955, 30,298.26 and 12,528.76 is: 17,289.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,955 : 30,298.26 = 12,528.76 : x
  2. Step 2: Convert to fraction form
    21,955/30,298.26 = 12,528.76/x
  3. Step 3: Cross multiply
    21,955x = 30,298.26 × 12,528.76
  4. Step 4: Simplify right side
    21,955x = 379,599,627.96
  5. Step 5: Solve for x
    x = 379,599,627.96/21,955
  6. Step 6: Final answer
    x = 17,289.89

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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.