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Finding the Fourth Proportional to 1,007.40, 1,390.60 and 614.44

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Solution

The fourth proportional to 1,007.40, 1,390.60 and 614.44 is: 848.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.40 : 1,390.60 = 614.44 : x
  2. Step 2: Convert to fraction form
    1,007.40/1,390.60 = 614.44/x
  3. Step 3: Cross multiply
    1,007.40x = 1,390.60 × 614.44
  4. Step 4: Simplify right side
    1,007.40x = 854,440.26
  5. Step 5: Solve for x
    x = 854,440.26/1,007.40
  6. Step 6: Final answer
    x = 848.16

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.