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Finding the Fourth Proportional to 15,501.78, 21,391.55 and 8,428.14

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Solution

The fourth proportional to 15,501.78, 21,391.55 and 8,428.14 is: 11,630.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,501.78 : 21,391.55 = 8,428.14 : x
  2. Step 2: Convert to fraction form
    15,501.78/21,391.55 = 8,428.14/x
  3. Step 3: Cross multiply
    15,501.78x = 21,391.55 × 8,428.14
  4. Step 4: Simplify right side
    15,501.78x = 180,290,978.22
  5. Step 5: Solve for x
    x = 180,290,978.22/15,501.78
  6. Step 6: Final answer
    x = 11,630.34

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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.