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Finding the Fourth Proportional to 707.09, 975.83 and 392.40

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Solution

The fourth proportional to 707.09, 975.83 and 392.40 is: 541.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.09 : 975.83 = 392.40 : x
  2. Step 2: Convert to fraction form
    707.09/975.83 = 392.40/x
  3. Step 3: Cross multiply
    707.09x = 975.83 × 392.40
  4. Step 4: Simplify right side
    707.09x = 382,913.73
  5. Step 5: Solve for x
    x = 382,913.73/707.09
  6. Step 6: Final answer
    x = 541.54

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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.