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Finding the Fourth Proportional to 1,137.18, 1,703.04 and 1,128.99

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Solution

The fourth proportional to 1,137.18, 1,703.04 and 1,128.99 is: 1,690.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,137.18 : 1,703.04 = 1,128.99 : x
  2. Step 2: Convert to fraction form
    1,137.18/1,703.04 = 1,128.99/x
  3. Step 3: Cross multiply
    1,137.18x = 1,703.04 × 1,128.99
  4. Step 4: Simplify right side
    1,137.18x = 1,922,715.13
  5. Step 5: Solve for x
    x = 1,922,715.13/1,137.18
  6. Step 6: Final answer
    x = 1,690.77

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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.