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Finding the Fourth Proportional to 1,127.98, 1,690.37 and 640.00

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Solution

The fourth proportional to 1,127.98, 1,690.37 and 640.00 is: 959.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.98 : 1,690.37 = 640.00 : x
  2. Step 2: Convert to fraction form
    1,127.98/1,690.37 = 640.00/x
  3. Step 3: Cross multiply
    1,127.98x = 1,690.37 × 640.00
  4. Step 4: Simplify right side
    1,127.98x = 1,081,838.11
  5. Step 5: Solve for x
    x = 1,081,838.11/1,127.98
  6. Step 6: Final answer
    x = 959.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.