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Finding the Fourth Proportional to 1,370.70, 2,056.95 and 785.70

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Solution

The fourth proportional to 1,370.70, 2,056.95 and 785.70 is: 1,179.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,370.70 : 2,056.95 = 785.70 : x
  2. Step 2: Convert to fraction form
    1,370.70/2,056.95 = 785.70/x
  3. Step 3: Cross multiply
    1,370.70x = 2,056.95 × 785.70
  4. Step 4: Simplify right side
    1,370.70x = 1,616,145.62
  5. Step 5: Solve for x
    x = 1,616,145.62/1,370.70
  6. Step 6: Final answer
    x = 1,179.07

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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.