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Finding the Fourth Proportional to 15,551.76, 21,460.64 and 8,478.12

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Solution

The fourth proportional to 15,551.76, 21,460.64 and 8,478.12 is: 11,699.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,551.76 : 21,460.64 = 8,478.12 : x
  2. Step 2: Convert to fraction form
    15,551.76/21,460.64 = 8,478.12/x
  3. Step 3: Cross multiply
    15,551.76x = 21,460.64 × 8,478.12
  4. Step 4: Simplify right side
    15,551.76x = 181,945,838.81
  5. Step 5: Solve for x
    x = 181,945,838.81/15,551.76
  6. Step 6: Final answer
    x = 11,699.37

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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.