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Finding the Fourth Proportional to 15,564, 21,478.32 and 9,975

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Solution

The fourth proportional to 15,564, 21,478.32 and 9,975 is: 13,765.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,564 : 21,478.32 = 9,975 : x
  2. Step 2: Convert to fraction form
    15,564/21,478.32 = 9,975/x
  3. Step 3: Cross multiply
    15,564x = 21,478.32 × 9,975
  4. Step 4: Simplify right side
    15,564x = 214,246,242
  5. Step 5: Solve for x
    x = 214,246,242/15,564
  6. Step 6: Final answer
    x = 13,765.50

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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.