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Finding the Fourth Proportional to 690, 949.41 and 666.06

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Solution

The fourth proportional to 690, 949.41 and 666.06 is: 916.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    690 : 949.41 = 666.06 : x
  2. Step 2: Convert to fraction form
    690/949.41 = 666.06/x
  3. Step 3: Cross multiply
    690x = 949.41 × 666.06
  4. Step 4: Simplify right side
    690x = 632,364.02
  5. Step 5: Solve for x
    x = 632,364.02/690
  6. Step 6: Final answer
    x = 916.47

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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.