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Finding the Fourth Proportional to 511.58, 705.93 and 312.51

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Solution

The fourth proportional to 511.58, 705.93 and 312.51 is: 431.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.58 : 705.93 = 312.51 : x
  2. Step 2: Convert to fraction form
    511.58/705.93 = 312.51/x
  3. Step 3: Cross multiply
    511.58x = 705.93 × 312.51
  4. Step 4: Simplify right side
    511.58x = 220,614.57
  5. Step 5: Solve for x
    x = 220,614.57/511.58
  6. Step 6: Final answer
    x = 431.24

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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.