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Finding the Fourth Proportional to 1,937.12, 2,905.44 and 638.72

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Solution

The fourth proportional to 1,937.12, 2,905.44 and 638.72 is: 958.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,937.12 : 2,905.44 = 638.72 : x
  2. Step 2: Convert to fraction form
    1,937.12/2,905.44 = 638.72/x
  3. Step 3: Cross multiply
    1,937.12x = 2,905.44 × 638.72
  4. Step 4: Simplify right side
    1,937.12x = 1,855,762.64
  5. Step 5: Solve for x
    x = 1,855,762.64/1,937.12
  6. Step 6: Final answer
    x = 958.00

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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.