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Finding the Fourth Proportional to 585.90, 808.38 and 420.39

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Solution

The fourth proportional to 585.90, 808.38 and 420.39 is: 580.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    585.90 : 808.38 = 420.39 : x
  2. Step 2: Convert to fraction form
    585.90/808.38 = 420.39/x
  3. Step 3: Cross multiply
    585.90x = 808.38 × 420.39
  4. Step 4: Simplify right side
    585.90x = 339,834.87
  5. Step 5: Solve for x
    x = 339,834.87/585.90
  6. Step 6: Final answer
    x = 580.02

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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.