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Finding the Fourth Proportional to 1,294.68, 1,786.56 and 705.20

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Solution

The fourth proportional to 1,294.68, 1,786.56 and 705.20 is: 973.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,294.68 : 1,786.56 = 705.20 : x
  2. Step 2: Convert to fraction form
    1,294.68/1,786.56 = 705.20/x
  3. Step 3: Cross multiply
    1,294.68x = 1,786.56 × 705.20
  4. Step 4: Simplify right side
    1,294.68x = 1,259,882.11
  5. Step 5: Solve for x
    x = 1,259,882.11/1,294.68
  6. Step 6: Final answer
    x = 973.12

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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.