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Finding the Fourth Proportional to 1,191.02, 1,643.22 and 666.95

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Solution

The fourth proportional to 1,191.02, 1,643.22 and 666.95 is: 920.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.02 : 1,643.22 = 666.95 : x
  2. Step 2: Convert to fraction form
    1,191.02/1,643.22 = 666.95/x
  3. Step 3: Cross multiply
    1,191.02x = 1,643.22 × 666.95
  4. Step 4: Simplify right side
    1,191.02x = 1,095,937.36
  5. Step 5: Solve for x
    x = 1,095,937.36/1,191.02
  6. Step 6: Final answer
    x = 920.17

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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.