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Finding the Fourth Proportional to 830.69, 1,145.69 and 774.80

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Solution

The fourth proportional to 830.69, 1,145.69 and 774.80 is: 1,068.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.69 : 1,145.69 = 774.80 : x
  2. Step 2: Convert to fraction form
    830.69/1,145.69 = 774.80/x
  3. Step 3: Cross multiply
    830.69x = 1,145.69 × 774.80
  4. Step 4: Simplify right side
    830.69x = 887,682.57
  5. Step 5: Solve for x
    x = 887,682.57/830.69
  6. Step 6: Final answer
    x = 1,068.61

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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.