Home / 12,985.55-19,479.69-6,405.41

Finding the Fourth Proportional to 12,985.55, 19,479.69 and 6,405.41

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Solution

The fourth proportional to 12,985.55, 19,479.69 and 6,405.41 is: 9,608.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,985.55 : 19,479.69 = 6,405.41 : x
  2. Step 2: Convert to fraction form
    12,985.55/19,479.69 = 6,405.41/x
  3. Step 3: Cross multiply
    12,985.55x = 19,479.69 × 6,405.41
  4. Step 4: Simplify right side
    12,985.55x = 124,775,449.82
  5. Step 5: Solve for x
    x = 124,775,449.82/12,985.55
  6. Step 6: Final answer
    x = 9,608.79

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.