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Finding the Fourth Proportional to 1,191.08, 1,643.40 and 693.45

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Solution

The fourth proportional to 1,191.08, 1,643.40 and 693.45 is: 956.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.08 : 1,643.40 = 693.45 : x
  2. Step 2: Convert to fraction form
    1,191.08/1,643.40 = 693.45/x
  3. Step 3: Cross multiply
    1,191.08x = 1,643.40 × 693.45
  4. Step 4: Simplify right side
    1,191.08x = 1,139,615.73
  5. Step 5: Solve for x
    x = 1,139,615.73/1,191.08
  6. Step 6: Final answer
    x = 956.79

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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.