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Finding the Fourth Proportional to 15,478.84, 21,365.68 and 9,889.84

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Solution

The fourth proportional to 15,478.84, 21,365.68 and 9,889.84 is: 13,651.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,478.84 : 21,365.68 = 9,889.84 : x
  2. Step 2: Convert to fraction form
    15,478.84/21,365.68 = 9,889.84/x
  3. Step 3: Cross multiply
    15,478.84x = 21,365.68 × 9,889.84
  4. Step 4: Simplify right side
    15,478.84x = 211,303,156.69
  5. Step 5: Solve for x
    x = 211,303,156.69/15,478.84
  6. Step 6: Final answer
    x = 13,651.10

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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.