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Finding the Fourth Proportional to 690.31, 952.70 and 515.35

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Solution

The fourth proportional to 690.31, 952.70 and 515.35 is: 711.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.31 : 952.70 = 515.35 : x
  2. Step 2: Convert to fraction form
    690.31/952.70 = 515.35/x
  3. Step 3: Cross multiply
    690.31x = 952.70 × 515.35
  4. Step 4: Simplify right side
    690.31x = 490,971.37
  5. Step 5: Solve for x
    x = 490,971.37/690.31
  6. Step 6: Final answer
    x = 711.23

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.