Home / 12,445.64-18,656.36-7,990.76

Finding the Fourth Proportional to 12,445.64, 18,656.36 and 7,990.76

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Solution

The fourth proportional to 12,445.64, 18,656.36 and 7,990.76 is: 11,978.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,445.64 : 18,656.36 = 7,990.76 : x
  2. Step 2: Convert to fraction form
    12,445.64/18,656.36 = 7,990.76/x
  3. Step 3: Cross multiply
    12,445.64x = 18,656.36 × 7,990.76
  4. Step 4: Simplify right side
    12,445.64x = 149,078,495.23
  5. Step 5: Solve for x
    x = 149,078,495.23/12,445.64
  6. Step 6: Final answer
    x = 11,978.37

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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.