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Finding the Fourth Proportional to 666.76, 920.16 and 368.01

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Solution

The fourth proportional to 666.76, 920.16 and 368.01 is: 507.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.76 : 920.16 = 368.01 : x
  2. Step 2: Convert to fraction form
    666.76/920.16 = 368.01/x
  3. Step 3: Cross multiply
    666.76x = 920.16 × 368.01
  4. Step 4: Simplify right side
    666.76x = 338,628.08
  5. Step 5: Solve for x
    x = 338,628.08/666.76
  6. Step 6: Final answer
    x = 507.87

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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.