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Finding the Fourth Proportional to 690.50, 1,035.88 and 305.76

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Solution

The fourth proportional to 690.50, 1,035.88 and 305.76 is: 458.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.50 : 1,035.88 = 305.76 : x
  2. Step 2: Convert to fraction form
    690.50/1,035.88 = 305.76/x
  3. Step 3: Cross multiply
    690.50x = 1,035.88 × 305.76
  4. Step 4: Simplify right side
    690.50x = 316,730.67
  5. Step 5: Solve for x
    x = 316,730.67/690.50
  6. Step 6: Final answer
    x = 458.70

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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.