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Finding the Fourth Proportional to 697.37, 1,045.90 and 210.30

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Solution

The fourth proportional to 697.37, 1,045.90 and 210.30 is: 315.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.37 : 1,045.90 = 210.30 : x
  2. Step 2: Convert to fraction form
    697.37/1,045.90 = 210.30/x
  3. Step 3: Cross multiply
    697.37x = 1,045.90 × 210.30
  4. Step 4: Simplify right side
    697.37x = 219,953.81
  5. Step 5: Solve for x
    x = 219,953.81/697.37
  6. Step 6: Final answer
    x = 315.41

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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.