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Finding the Fourth Proportional to 690.66, 1,035.45 and 325.17

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Solution

The fourth proportional to 690.66, 1,035.45 and 325.17 is: 487.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.66 : 1,035.45 = 325.17 : x
  2. Step 2: Convert to fraction form
    690.66/1,035.45 = 325.17/x
  3. Step 3: Cross multiply
    690.66x = 1,035.45 × 325.17
  4. Step 4: Simplify right side
    690.66x = 336,697.28
  5. Step 5: Solve for x
    x = 336,697.28/690.66
  6. Step 6: Final answer
    x = 487.50

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.