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Finding the Fourth Proportional to 1,137.37, 1,569.55 and 639.98

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Solution

The fourth proportional to 1,137.37, 1,569.55 and 639.98 is: 883.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,137.37 : 1,569.55 = 639.98 : x
  2. Step 2: Convert to fraction form
    1,137.37/1,569.55 = 639.98/x
  3. Step 3: Cross multiply
    1,137.37x = 1,569.55 × 639.98
  4. Step 4: Simplify right side
    1,137.37x = 1,004,475.63
  5. Step 5: Solve for x
    x = 1,004,475.63/1,137.37
  6. Step 6: Final answer
    x = 883.16

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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.