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Finding the Fourth Proportional to 3,178.82, 4,768.14 and 870.32

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Solution

The fourth proportional to 3,178.82, 4,768.14 and 870.32 is: 1,305.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,178.82 : 4,768.14 = 870.32 : x
  2. Step 2: Convert to fraction form
    3,178.82/4,768.14 = 870.32/x
  3. Step 3: Cross multiply
    3,178.82x = 4,768.14 × 870.32
  4. Step 4: Simplify right side
    3,178.82x = 4,149,807.60
  5. Step 5: Solve for x
    x = 4,149,807.60/3,178.82
  6. Step 6: Final answer
    x = 1,305.46

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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.