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Finding the Fourth Proportional to 1,038.88, 1,434.06 and 640.60

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Solution

The fourth proportional to 1,038.88, 1,434.06 and 640.60 is: 884.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.88 : 1,434.06 = 640.60 : x
  2. Step 2: Convert to fraction form
    1,038.88/1,434.06 = 640.60/x
  3. Step 3: Cross multiply
    1,038.88x = 1,434.06 × 640.60
  4. Step 4: Simplify right side
    1,038.88x = 918,658.84
  5. Step 5: Solve for x
    x = 918,658.84/1,038.88
  6. Step 6: Final answer
    x = 884.28

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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.