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Finding the Fourth Proportional to 1,190.57, 1,642.95 and 666.63

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Solution

The fourth proportional to 1,190.57, 1,642.95 and 666.63 is: 919.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,190.57 : 1,642.95 = 666.63 : x
  2. Step 2: Convert to fraction form
    1,190.57/1,642.95 = 666.63/x
  3. Step 3: Cross multiply
    1,190.57x = 1,642.95 × 666.63
  4. Step 4: Simplify right side
    1,190.57x = 1,095,239.76
  5. Step 5: Solve for x
    x = 1,095,239.76/1,190.57
  6. Step 6: Final answer
    x = 919.93

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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.