Home / 12,478.16-18,710.96-4,155.21

Finding the Fourth Proportional to 12,478.16, 18,710.96 and 4,155.21

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Solution

The fourth proportional to 12,478.16, 18,710.96 and 4,155.21 is: 6,230.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,478.16 : 18,710.96 = 4,155.21 : x
  2. Step 2: Convert to fraction form
    12,478.16/18,710.96 = 4,155.21/x
  3. Step 3: Cross multiply
    12,478.16x = 18,710.96 × 4,155.21
  4. Step 4: Simplify right side
    12,478.16x = 77,747,968.10
  5. Step 5: Solve for x
    x = 77,747,968.10/12,478.16
  6. Step 6: Final answer
    x = 6,230.72

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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.