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Finding the Fourth Proportional to 1,239.34, 1,859.12 and 417.32

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Solution

The fourth proportional to 1,239.34, 1,859.12 and 417.32 is: 626.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.34 : 1,859.12 = 417.32 : x
  2. Step 2: Convert to fraction form
    1,239.34/1,859.12 = 417.32/x
  3. Step 3: Cross multiply
    1,239.34x = 1,859.12 × 417.32
  4. Step 4: Simplify right side
    1,239.34x = 775,847.96
  5. Step 5: Solve for x
    x = 775,847.96/1,239.34
  6. Step 6: Final answer
    x = 626.02

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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.