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Finding the Fourth Proportional to 15,558, 21,463.22 and 9,889.70

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Solution

The fourth proportional to 15,558, 21,463.22 and 9,889.70 is: 13,643.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,558 : 21,463.22 = 9,889.70 : x
  2. Step 2: Convert to fraction form
    15,558/21,463.22 = 9,889.70/x
  3. Step 3: Cross multiply
    15,558x = 21,463.22 × 9,889.70
  4. Step 4: Simplify right side
    15,558x = 212,264,806.83
  5. Step 5: Solve for x
    x = 212,264,806.83/15,558
  6. Step 6: Final answer
    x = 13,643.45

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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.