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Finding the Fourth Proportional to 511.47, 705.93 and 290.40

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Solution

The fourth proportional to 511.47, 705.93 and 290.40 is: 400.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.47 : 705.93 = 290.40 : x
  2. Step 2: Convert to fraction form
    511.47/705.93 = 290.40/x
  3. Step 3: Cross multiply
    511.47x = 705.93 × 290.40
  4. Step 4: Simplify right side
    511.47x = 205,002.07
  5. Step 5: Solve for x
    x = 205,002.07/511.47
  6. Step 6: Final answer
    x = 400.81

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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.