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Finding the Fourth Proportional to 642.26, 955.15 and 621.77

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Solution

The fourth proportional to 642.26, 955.15 and 621.77 is: 924.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.26 : 955.15 = 621.77 : x
  2. Step 2: Convert to fraction form
    642.26/955.15 = 621.77/x
  3. Step 3: Cross multiply
    642.26x = 955.15 × 621.77
  4. Step 4: Simplify right side
    642.26x = 593,877.29
  5. Step 5: Solve for x
    x = 593,877.29/642.26
  6. Step 6: Final answer
    x = 924.66

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.