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Finding the Fourth Proportional to 555.08, 765.99 and 345.21

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Solution

The fourth proportional to 555.08, 765.99 and 345.21 is: 476.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.08 : 765.99 = 345.21 : x
  2. Step 2: Convert to fraction form
    555.08/765.99 = 345.21/x
  3. Step 3: Cross multiply
    555.08x = 765.99 × 345.21
  4. Step 4: Simplify right side
    555.08x = 264,428.70
  5. Step 5: Solve for x
    x = 264,428.70/555.08
  6. Step 6: Final answer
    x = 476.38

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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.