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Finding the Fourth Proportional to 15,509.72, 21,391.95 and 9,839.58

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Solution

The fourth proportional to 15,509.72, 21,391.95 and 9,839.58 is: 13,571.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,509.72 : 21,391.95 = 9,839.58 : x
  2. Step 2: Convert to fraction form
    15,509.72/21,391.95 = 9,839.58/x
  3. Step 3: Cross multiply
    15,509.72x = 21,391.95 × 9,839.58
  4. Step 4: Simplify right side
    15,509.72x = 210,487,803.38
  5. Step 5: Solve for x
    x = 210,487,803.38/15,509.72
  6. Step 6: Final answer
    x = 13,571.35

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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.