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Finding the Fourth Proportional to 1,368.32, 2,051.61 and 638.12

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Solution

The fourth proportional to 1,368.32, 2,051.61 and 638.12 is: 956.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,368.32 : 2,051.61 = 638.12 : x
  2. Step 2: Convert to fraction form
    1,368.32/2,051.61 = 638.12/x
  3. Step 3: Cross multiply
    1,368.32x = 2,051.61 × 638.12
  4. Step 4: Simplify right side
    1,368.32x = 1,309,173.37
  5. Step 5: Solve for x
    x = 1,309,173.37/1,368.32
  6. Step 6: Final answer
    x = 956.77

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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.