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Finding the Fourth Proportional to 15,558.40, 21,471 and 9,509.62

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Solution

The fourth proportional to 15,558.40, 21,471 and 9,509.62 is: 13,123.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,558.40 : 21,471 = 9,509.62 : x
  2. Step 2: Convert to fraction form
    15,558.40/21,471 = 9,509.62/x
  3. Step 3: Cross multiply
    15,558.40x = 21,471 × 9,509.62
  4. Step 4: Simplify right side
    15,558.40x = 204,181,051.02
  5. Step 5: Solve for x
    x = 204,181,051.02/15,558.40
  6. Step 6: Final answer
    x = 13,123.52

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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.