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Finding the Fourth Proportional to 1,247.51, 1,870.74 and 425.42

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Solution

The fourth proportional to 1,247.51, 1,870.74 and 425.42 is: 637.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.51 : 1,870.74 = 425.42 : x
  2. Step 2: Convert to fraction form
    1,247.51/1,870.74 = 425.42/x
  3. Step 3: Cross multiply
    1,247.51x = 1,870.74 × 425.42
  4. Step 4: Simplify right side
    1,247.51x = 795,847.87
  5. Step 5: Solve for x
    x = 795,847.87/1,247.51
  6. Step 6: Final answer
    x = 637.95

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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.