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Finding the Fourth Proportional to 15,556, 21,459.88 and 10,521.98

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Solution

The fourth proportional to 15,556, 21,459.88 and 10,521.98 is: 14,515.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,556 : 21,459.88 = 10,521.98 : x
  2. Step 2: Convert to fraction form
    15,556/21,459.88 = 10,521.98/x
  3. Step 3: Cross multiply
    15,556x = 21,459.88 × 10,521.98
  4. Step 4: Simplify right side
    15,556x = 225,800,428.16
  5. Step 5: Solve for x
    x = 225,800,428.16/15,556
  6. Step 6: Final answer
    x = 14,515.33

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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.