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Finding the Fourth Proportional to 707.88, 1,058.88 and 640.38

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Solution

The fourth proportional to 707.88, 1,058.88 and 640.38 is: 957.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.88 : 1,058.88 = 640.38 : x
  2. Step 2: Convert to fraction form
    707.88/1,058.88 = 640.38/x
  3. Step 3: Cross multiply
    707.88x = 1,058.88 × 640.38
  4. Step 4: Simplify right side
    707.88x = 678,085.57
  5. Step 5: Solve for x
    x = 678,085.57/707.88
  6. Step 6: Final answer
    x = 957.91

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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.