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Finding the Fourth Proportional to 1,038.67, 1,433.47 and 640.30

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Solution

The fourth proportional to 1,038.67, 1,433.47 and 640.30 is: 883.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.67 : 1,433.47 = 640.30 : x
  2. Step 2: Convert to fraction form
    1,038.67/1,433.47 = 640.30/x
  3. Step 3: Cross multiply
    1,038.67x = 1,433.47 × 640.30
  4. Step 4: Simplify right side
    1,038.67x = 917,850.84
  5. Step 5: Solve for x
    x = 917,850.84/1,038.67
  6. Step 6: Final answer
    x = 883.68

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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.