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Finding the Fourth Proportional to 1,294.70, 1,786.70 and 705.22

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Solution

The fourth proportional to 1,294.70, 1,786.70 and 705.22 is: 973.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,294.70 : 1,786.70 = 705.22 : x
  2. Step 2: Convert to fraction form
    1,294.70/1,786.70 = 705.22/x
  3. Step 3: Cross multiply
    1,294.70x = 1,786.70 × 705.22
  4. Step 4: Simplify right side
    1,294.70x = 1,260,017.51
  5. Step 5: Solve for x
    x = 1,260,017.51/1,294.70
  6. Step 6: Final answer
    x = 973.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.