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Finding the Fourth Proportional to 660.69, 911.96 and 427.77

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Solution

The fourth proportional to 660.69, 911.96 and 427.77 is: 590.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.69 : 911.96 = 427.77 : x
  2. Step 2: Convert to fraction form
    660.69/911.96 = 427.77/x
  3. Step 3: Cross multiply
    660.69x = 911.96 × 427.77
  4. Step 4: Simplify right side
    660.69x = 390,106.99
  5. Step 5: Solve for x
    x = 390,106.99/660.69
  6. Step 6: Final answer
    x = 590.45

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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.