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Finding the Fourth Proportional to 666.90, 995.09 and 558.90

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Solution

The fourth proportional to 666.90, 995.09 and 558.90 is: 833.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.90 : 995.09 = 558.90 : x
  2. Step 2: Convert to fraction form
    666.90/995.09 = 558.90/x
  3. Step 3: Cross multiply
    666.90x = 995.09 × 558.90
  4. Step 4: Simplify right side
    666.90x = 556,153.01
  5. Step 5: Solve for x
    x = 556,153.01/666.90
  6. Step 6: Final answer
    x = 833.94

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.