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Finding the Fourth Proportional to 1,217.02, 1,679.48 and 693.05

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Solution

The fourth proportional to 1,217.02, 1,679.48 and 693.05 is: 956.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,217.02 : 1,679.48 = 693.05 : x
  2. Step 2: Convert to fraction form
    1,217.02/1,679.48 = 693.05/x
  3. Step 3: Cross multiply
    1,217.02x = 1,679.48 × 693.05
  4. Step 4: Simplify right side
    1,217.02x = 1,163,956.95
  5. Step 5: Solve for x
    x = 1,163,956.95/1,217.02
  6. Step 6: Final answer
    x = 956.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.