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Finding the Fourth Proportional to 13,392.90, 18,478.54 and 8,357.93

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Solution

The fourth proportional to 13,392.90, 18,478.54 and 8,357.93 is: 11,531.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,392.90 : 18,478.54 = 8,357.93 : x
  2. Step 2: Convert to fraction form
    13,392.90/18,478.54 = 8,357.93/x
  3. Step 3: Cross multiply
    13,392.90x = 18,478.54 × 8,357.93
  4. Step 4: Simplify right side
    13,392.90x = 154,442,343.82
  5. Step 5: Solve for x
    x = 154,442,343.82/13,392.90
  6. Step 6: Final answer
    x = 11,531.66

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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.