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Finding the Fourth Proportional to 1,217.12, 1,678.96 and 774.24

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Solution

The fourth proportional to 1,217.12, 1,678.96 and 774.24 is: 1,068.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,217.12 : 1,678.96 = 774.24 : x
  2. Step 2: Convert to fraction form
    1,217.12/1,678.96 = 774.24/x
  3. Step 3: Cross multiply
    1,217.12x = 1,678.96 × 774.24
  4. Step 4: Simplify right side
    1,217.12x = 1,299,917.99
  5. Step 5: Solve for x
    x = 1,299,917.99/1,217.12
  6. Step 6: Final answer
    x = 1,068.03

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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.