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Finding the Fourth Proportional to 642.02, 885.48 and 589.72

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Solution

The fourth proportional to 642.02, 885.48 and 589.72 is: 813.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.02 : 885.48 = 589.72 : x
  2. Step 2: Convert to fraction form
    642.02/885.48 = 589.72/x
  3. Step 3: Cross multiply
    642.02x = 885.48 × 589.72
  4. Step 4: Simplify right side
    642.02x = 522,185.27
  5. Step 5: Solve for x
    x = 522,185.27/642.02
  6. Step 6: Final answer
    x = 813.35

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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.