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Finding the Fourth Proportional to 953.90, 1,317.20 and 622.20

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Solution

The fourth proportional to 953.90, 1,317.20 and 622.20 is: 859.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    953.90 : 1,317.20 = 622.20 : x
  2. Step 2: Convert to fraction form
    953.90/1,317.20 = 622.20/x
  3. Step 3: Cross multiply
    953.90x = 1,317.20 × 622.20
  4. Step 4: Simplify right side
    953.90x = 819,561.84
  5. Step 5: Solve for x
    x = 819,561.84/953.90
  6. Step 6: Final answer
    x = 859.17

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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.