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Finding the Fourth Proportional to 623.72, 860.77 and 358.21

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Solution

The fourth proportional to 623.72, 860.77 and 358.21 is: 494.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.72 : 860.77 = 358.21 : x
  2. Step 2: Convert to fraction form
    623.72/860.77 = 358.21/x
  3. Step 3: Cross multiply
    623.72x = 860.77 × 358.21
  4. Step 4: Simplify right side
    623.72x = 308,333.37
  5. Step 5: Solve for x
    x = 308,333.37/623.72
  6. Step 6: Final answer
    x = 494.34

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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.