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Finding the Fourth Proportional to 430.04, 643.82 and 389.01

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Solution

The fourth proportional to 430.04, 643.82 and 389.01 is: 582.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.04 : 643.82 = 389.01 : x
  2. Step 2: Convert to fraction form
    430.04/643.82 = 389.01/x
  3. Step 3: Cross multiply
    430.04x = 643.82 × 389.01
  4. Step 4: Simplify right side
    430.04x = 250,451.08
  5. Step 5: Solve for x
    x = 250,451.08/430.04
  6. Step 6: Final answer
    x = 582.39

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.