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Finding the Fourth Proportional to 1,038.40, 1,431.66 and 683.62

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Solution

The fourth proportional to 1,038.40, 1,431.66 and 683.62 is: 942.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.40 : 1,431.66 = 683.62 : x
  2. Step 2: Convert to fraction form
    1,038.40/1,431.66 = 683.62/x
  3. Step 3: Cross multiply
    1,038.40x = 1,431.66 × 683.62
  4. Step 4: Simplify right side
    1,038.40x = 978,711.41
  5. Step 5: Solve for x
    x = 978,711.41/1,038.40
  6. Step 6: Final answer
    x = 942.52

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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.