Home / 3,111.10-4,666.20-919.72

Finding the Fourth Proportional to 3,111.10, 4,666.20 and 919.72

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Solution

The fourth proportional to 3,111.10, 4,666.20 and 919.72 is: 1,379.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,111.10 : 4,666.20 = 919.72 : x
  2. Step 2: Convert to fraction form
    3,111.10/4,666.20 = 919.72/x
  3. Step 3: Cross multiply
    3,111.10x = 4,666.20 × 919.72
  4. Step 4: Simplify right side
    3,111.10x = 4,291,597.46
  5. Step 5: Solve for x
    x = 4,291,597.46/3,111.10
  6. Step 6: Final answer
    x = 1,379.45

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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.