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Finding the Fourth Proportional to 1,191.10, 1,643.74 and 693.76

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Solution

The fourth proportional to 1,191.10, 1,643.74 and 693.76 is: 957.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.10 : 1,643.74 = 693.76 : x
  2. Step 2: Convert to fraction form
    1,191.10/1,643.74 = 693.76/x
  3. Step 3: Cross multiply
    1,191.10x = 1,643.74 × 693.76
  4. Step 4: Simplify right side
    1,191.10x = 1,140,361.06
  5. Step 5: Solve for x
    x = 1,140,361.06/1,191.10
  6. Step 6: Final answer
    x = 957.40

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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.