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Finding the Fourth Proportional to 690.99, 1,034.93 and 416.51

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Solution

The fourth proportional to 690.99, 1,034.93 and 416.51 is: 623.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.99 : 1,034.93 = 416.51 : x
  2. Step 2: Convert to fraction form
    690.99/1,034.93 = 416.51/x
  3. Step 3: Cross multiply
    690.99x = 1,034.93 × 416.51
  4. Step 4: Simplify right side
    690.99x = 431,051.44
  5. Step 5: Solve for x
    x = 431,051.44/690.99
  6. Step 6: Final answer
    x = 623.82

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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.