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Finding the Fourth Proportional to 643.05, 970.07 and 623.90

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Solution

The fourth proportional to 643.05, 970.07 and 623.90 is: 941.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.05 : 970.07 = 623.90 : x
  2. Step 2: Convert to fraction form
    643.05/970.07 = 623.90/x
  3. Step 3: Cross multiply
    643.05x = 970.07 × 623.90
  4. Step 4: Simplify right side
    643.05x = 605,226.67
  5. Step 5: Solve for x
    x = 605,226.67/643.05
  6. Step 6: Final answer
    x = 941.18

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.