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Finding the Fourth Proportional to 1,247.17, 1,870.29 and 425.22

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Solution

The fourth proportional to 1,247.17, 1,870.29 and 425.22 is: 637.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.17 : 1,870.29 = 425.22 : x
  2. Step 2: Convert to fraction form
    1,247.17/1,870.29 = 425.22/x
  3. Step 3: Cross multiply
    1,247.17x = 1,870.29 × 425.22
  4. Step 4: Simplify right side
    1,247.17x = 795,284.71
  5. Step 5: Solve for x
    x = 795,284.71/1,247.17
  6. Step 6: Final answer
    x = 637.67

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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.