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Finding the Fourth Proportional to 15,369.92, 21,208.72 and 8,655.36

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Solution

The fourth proportional to 15,369.92, 21,208.72 and 8,655.36 is: 11,943.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,369.92 : 21,208.72 = 8,655.36 : x
  2. Step 2: Convert to fraction form
    15,369.92/21,208.72 = 8,655.36/x
  3. Step 3: Cross multiply
    15,369.92x = 21,208.72 × 8,655.36
  4. Step 4: Simplify right side
    15,369.92x = 183,569,106.74
  5. Step 5: Solve for x
    x = 183,569,106.74/15,369.92
  6. Step 6: Final answer
    x = 11,943.40

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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.