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Finding the Fourth Proportional to 1,247.09, 1,870.20 and 425.16

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Solution

The fourth proportional to 1,247.09, 1,870.20 and 425.16 is: 637.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.09 : 1,870.20 = 425.16 : x
  2. Step 2: Convert to fraction form
    1,247.09/1,870.20 = 425.16/x
  3. Step 3: Cross multiply
    1,247.09x = 1,870.20 × 425.16
  4. Step 4: Simplify right side
    1,247.09x = 795,134.23
  5. Step 5: Solve for x
    x = 795,134.23/1,247.09
  6. Step 6: Final answer
    x = 637.59

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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.