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Finding the Fourth Proportional to 697.21, 1,045.53 and 312.19

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Solution

The fourth proportional to 697.21, 1,045.53 and 312.19 is: 468.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.21 : 1,045.53 = 312.19 : x
  2. Step 2: Convert to fraction form
    697.21/1,045.53 = 312.19/x
  3. Step 3: Cross multiply
    697.21x = 1,045.53 × 312.19
  4. Step 4: Simplify right side
    697.21x = 326,401.40
  5. Step 5: Solve for x
    x = 326,401.40/697.21
  6. Step 6: Final answer
    x = 468.16

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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.