Home / 1,178.32-1,767.60-312.72

Finding the Fourth Proportional to 1,178.32, 1,767.60 and 312.72

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Solution

The fourth proportional to 1,178.32, 1,767.60 and 312.72 is: 469.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,178.32 : 1,767.60 = 312.72 : x
  2. Step 2: Convert to fraction form
    1,178.32/1,767.60 = 312.72/x
  3. Step 3: Cross multiply
    1,178.32x = 1,767.60 × 312.72
  4. Step 4: Simplify right side
    1,178.32x = 552,763.87
  5. Step 5: Solve for x
    x = 552,763.87/1,178.32
  6. Step 6: Final answer
    x = 469.11

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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.