Home / 15,375.74-21,219.31-9,405.54

Finding the Fourth Proportional to 15,375.74, 21,219.31 and 9,405.54

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Solution

The fourth proportional to 15,375.74, 21,219.31 and 9,405.54 is: 12,980.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,375.74 : 21,219.31 = 9,405.54 : x
  2. Step 2: Convert to fraction form
    15,375.74/21,219.31 = 9,405.54/x
  3. Step 3: Cross multiply
    15,375.74x = 21,219.31 × 9,405.54
  4. Step 4: Simplify right side
    15,375.74x = 199,579,068.98
  5. Step 5: Solve for x
    x = 199,579,068.98/15,375.74
  6. Step 6: Final answer
    x = 12,980.13

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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.