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Finding the Fourth Proportional to 400.08, 595.86 and 390.54

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Solution

The fourth proportional to 400.08, 595.86 and 390.54 is: 581.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.08 : 595.86 = 390.54 : x
  2. Step 2: Convert to fraction form
    400.08/595.86 = 390.54/x
  3. Step 3: Cross multiply
    400.08x = 595.86 × 390.54
  4. Step 4: Simplify right side
    400.08x = 232,707.16
  5. Step 5: Solve for x
    x = 232,707.16/400.08
  6. Step 6: Final answer
    x = 581.65

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.