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Finding the Fourth Proportional to 611.77, 918.03 and 510.31

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Solution

The fourth proportional to 611.77, 918.03 and 510.31 is: 765.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.77 : 918.03 = 510.31 : x
  2. Step 2: Convert to fraction form
    611.77/918.03 = 510.31/x
  3. Step 3: Cross multiply
    611.77x = 918.03 × 510.31
  4. Step 4: Simplify right side
    611.77x = 468,479.89
  5. Step 5: Solve for x
    x = 468,479.89/611.77
  6. Step 6: Final answer
    x = 765.78

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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.