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Finding the Fourth Proportional to 666.77, 920.43 and 519.14

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Solution

The fourth proportional to 666.77, 920.43 and 519.14 is: 716.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.77 : 920.43 = 519.14 : x
  2. Step 2: Convert to fraction form
    666.77/920.43 = 519.14/x
  3. Step 3: Cross multiply
    666.77x = 920.43 × 519.14
  4. Step 4: Simplify right side
    666.77x = 477,834.33
  5. Step 5: Solve for x
    x = 477,834.33/666.77
  6. Step 6: Final answer
    x = 716.65

Related Problems

Find fourth proportional to 333.38, 460.22 and 259.57
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.