Home / 12,315.08-18,478.30-7,640.58

Finding the Fourth Proportional to 12,315.08, 18,478.30 and 7,640.58

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Solution

The fourth proportional to 12,315.08, 18,478.30 and 7,640.58 is: 11,464.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,315.08 : 18,478.30 = 7,640.58 : x
  2. Step 2: Convert to fraction form
    12,315.08/18,478.30 = 7,640.58/x
  3. Step 3: Cross multiply
    12,315.08x = 18,478.30 × 7,640.58
  4. Step 4: Simplify right side
    12,315.08x = 141,184,929.41
  5. Step 5: Solve for x
    x = 141,184,929.41/12,315.08
  6. Step 6: Final answer
    x = 11,464.39

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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.