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Finding the Fourth Proportional to 690.85, 953.69 and 442.50

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Solution

The fourth proportional to 690.85, 953.69 and 442.50 is: 610.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.85 : 953.69 = 442.50 : x
  2. Step 2: Convert to fraction form
    690.85/953.69 = 442.50/x
  3. Step 3: Cross multiply
    690.85x = 953.69 × 442.50
  4. Step 4: Simplify right side
    690.85x = 422,007.83
  5. Step 5: Solve for x
    x = 422,007.83/690.85
  6. Step 6: Final answer
    x = 610.85

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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.