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Finding the Fourth Proportional to 666.76, 920.37 and 404.77

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Solution

The fourth proportional to 666.76, 920.37 and 404.77 is: 558.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.76 : 920.37 = 404.77 : x
  2. Step 2: Convert to fraction form
    666.76/920.37 = 404.77/x
  3. Step 3: Cross multiply
    666.76x = 920.37 × 404.77
  4. Step 4: Simplify right side
    666.76x = 372,538.16
  5. Step 5: Solve for x
    x = 372,538.16/666.76
  6. Step 6: Final answer
    x = 558.73

Related Problems

Find fourth proportional to 333.38, 460.19 and 202.39
Half scale
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Double scale
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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.