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Finding the Fourth Proportional to 623.08, 859.98 and 389.80

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Solution

The fourth proportional to 623.08, 859.98 and 389.80 is: 538.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.08 : 859.98 = 389.80 : x
  2. Step 2: Convert to fraction form
    623.08/859.98 = 389.80/x
  3. Step 3: Cross multiply
    623.08x = 859.98 × 389.80
  4. Step 4: Simplify right side
    623.08x = 335,220.20
  5. Step 5: Solve for x
    x = 335,220.20/623.08
  6. Step 6: Final answer
    x = 538.01

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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.