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Finding the Fourth Proportional to 1,239.32, 1,858.88 and 417.58

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Solution

The fourth proportional to 1,239.32, 1,858.88 and 417.58 is: 626.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.32 : 1,858.88 = 417.58 : x
  2. Step 2: Convert to fraction form
    1,239.32/1,858.88 = 417.58/x
  3. Step 3: Cross multiply
    1,239.32x = 1,858.88 × 417.58
  4. Step 4: Simplify right side
    1,239.32x = 776,227.51
  5. Step 5: Solve for x
    x = 776,227.51/1,239.32
  6. Step 6: Final answer
    x = 626.33

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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.