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Finding the Fourth Proportional to 1,239.90, 1,859.28 and 374.28

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Solution

The fourth proportional to 1,239.90, 1,859.28 and 374.28 is: 561.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.90 : 1,859.28 = 374.28 : x
  2. Step 2: Convert to fraction form
    1,239.90/1,859.28 = 374.28/x
  3. Step 3: Cross multiply
    1,239.90x = 1,859.28 × 374.28
  4. Step 4: Simplify right side
    1,239.90x = 695,891.32
  5. Step 5: Solve for x
    x = 695,891.32/1,239.90
  6. Step 6: Final answer
    x = 561.25

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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.