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Finding the Fourth Proportional to 690.07, 1,034.80 and 300.05

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Solution

The fourth proportional to 690.07, 1,034.80 and 300.05 is: 449.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.07 : 1,034.80 = 300.05 : x
  2. Step 2: Convert to fraction form
    690.07/1,034.80 = 300.05/x
  3. Step 3: Cross multiply
    690.07x = 1,034.80 × 300.05
  4. Step 4: Simplify right side
    690.07x = 310,491.74
  5. Step 5: Solve for x
    x = 310,491.74/690.07
  6. Step 6: Final answer
    x = 449.94

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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.