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Finding the Fourth Proportional to 970.85, 1,340.69 and 622.15

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Solution

The fourth proportional to 970.85, 1,340.69 and 622.15 is: 859.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.85 : 1,340.69 = 622.15 : x
  2. Step 2: Convert to fraction form
    970.85/1,340.69 = 622.15/x
  3. Step 3: Cross multiply
    970.85x = 1,340.69 × 622.15
  4. Step 4: Simplify right side
    970.85x = 834,103.82
  5. Step 5: Solve for x
    x = 834,103.82/970.85
  6. Step 6: Final answer
    x = 859.15

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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.