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Finding the Fourth Proportional to 13,888.65, 19,166.26 and 7,920.19

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Solution

The fourth proportional to 13,888.65, 19,166.26 and 7,920.19 is: 10,929.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,888.65 : 19,166.26 = 7,920.19 : x
  2. Step 2: Convert to fraction form
    13,888.65/19,166.26 = 7,920.19/x
  3. Step 3: Cross multiply
    13,888.65x = 19,166.26 × 7,920.19
  4. Step 4: Simplify right side
    13,888.65x = 151,800,420.79
  5. Step 5: Solve for x
    x = 151,800,420.79/13,888.65
  6. Step 6: Final answer
    x = 10,929.82

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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.