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Finding the Fourth Proportional to 1,390.46, 2,084.80 and 696.94

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Solution

The fourth proportional to 1,390.46, 2,084.80 and 696.94 is: 1,044.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.46 : 2,084.80 = 696.94 : x
  2. Step 2: Convert to fraction form
    1,390.46/2,084.80 = 696.94/x
  3. Step 3: Cross multiply
    1,390.46x = 2,084.80 × 696.94
  4. Step 4: Simplify right side
    1,390.46x = 1,452,980.51
  5. Step 5: Solve for x
    x = 1,452,980.51/1,390.46
  6. Step 6: Final answer
    x = 1,044.96

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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.