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Finding the Fourth Proportional to 690.86, 953.35 and 442.25

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Solution

The fourth proportional to 690.86, 953.35 and 442.25 is: 610.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.86 : 953.35 = 442.25 : x
  2. Step 2: Convert to fraction form
    690.86/953.35 = 442.25/x
  3. Step 3: Cross multiply
    690.86x = 953.35 × 442.25
  4. Step 4: Simplify right side
    690.86x = 421,616.74
  5. Step 5: Solve for x
    x = 421,616.74/690.86
  6. Step 6: Final answer
    x = 610.28

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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.