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Finding the Fourth Proportional to 666.77, 920.16 and 401.29

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Solution

The fourth proportional to 666.77, 920.16 and 401.29 is: 553.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.77 : 920.16 = 401.29 : x
  2. Step 2: Convert to fraction form
    666.77/920.16 = 401.29/x
  3. Step 3: Cross multiply
    666.77x = 920.16 × 401.29
  4. Step 4: Simplify right side
    666.77x = 369,248.71
  5. Step 5: Solve for x
    x = 369,248.71/666.77
  6. Step 6: Final answer
    x = 553.79

Related Problems

Find fourth proportional to 333.38, 460.08 and 200.64
Half scale
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Double scale
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Similar ratio
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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.