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Finding the Fourth Proportional to 430.69, 646.29 and 405.07

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Solution

The fourth proportional to 430.69, 646.29 and 405.07 is: 607.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.69 : 646.29 = 405.07 : x
  2. Step 2: Convert to fraction form
    430.69/646.29 = 405.07/x
  3. Step 3: Cross multiply
    430.69x = 646.29 × 405.07
  4. Step 4: Simplify right side
    430.69x = 261,792.69
  5. Step 5: Solve for x
    x = 261,792.69/430.69
  6. Step 6: Final answer
    x = 607.84

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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.