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Finding the Fourth Proportional to 1,127.37, 1,690.60 and 688.45

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Solution

The fourth proportional to 1,127.37, 1,690.60 and 688.45 is: 1,032.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.37 : 1,690.60 = 688.45 : x
  2. Step 2: Convert to fraction form
    1,127.37/1,690.60 = 688.45/x
  3. Step 3: Cross multiply
    1,127.37x = 1,690.60 × 688.45
  4. Step 4: Simplify right side
    1,127.37x = 1,163,890.15
  5. Step 5: Solve for x
    x = 1,163,890.15/1,127.37
  6. Step 6: Final answer
    x = 1,032.40

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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.