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Finding the Fourth Proportional to 622.67, 858.93 and 386.51

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Solution

The fourth proportional to 622.67, 858.93 and 386.51 is: 533.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.67 : 858.93 = 386.51 : x
  2. Step 2: Convert to fraction form
    622.67/858.93 = 386.51/x
  3. Step 3: Cross multiply
    622.67x = 858.93 × 386.51
  4. Step 4: Simplify right side
    622.67x = 331,985.03
  5. Step 5: Solve for x
    x = 331,985.03/622.67
  6. Step 6: Final answer
    x = 533.16

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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.