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Finding the Fourth Proportional to 880.12, 1,213.14 and 693.31

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Solution

The fourth proportional to 880.12, 1,213.14 and 693.31 is: 955.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.12 : 1,213.14 = 693.31 : x
  2. Step 2: Convert to fraction form
    880.12/1,213.14 = 693.31/x
  3. Step 3: Cross multiply
    880.12x = 1,213.14 × 693.31
  4. Step 4: Simplify right side
    880.12x = 841,083.94
  5. Step 5: Solve for x
    x = 841,083.94/880.12
  6. Step 6: Final answer
    x = 955.65

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1.5x scale

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.