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Finding the Fourth Proportional to 15,810.69, 21,818.48 and 8,640.45

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Solution

The fourth proportional to 15,810.69, 21,818.48 and 8,640.45 is: 11,923.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,810.69 : 21,818.48 = 8,640.45 : x
  2. Step 2: Convert to fraction form
    15,810.69/21,818.48 = 8,640.45/x
  3. Step 3: Cross multiply
    15,810.69x = 21,818.48 × 8,640.45
  4. Step 4: Simplify right side
    15,810.69x = 188,521,442.31
  5. Step 5: Solve for x
    x = 188,521,442.31/15,810.69
  6. Step 6: Final answer
    x = 11,923.67

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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.