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Finding the Fourth Proportional to 657.79, 907.80 and 395.89

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Solution

The fourth proportional to 657.79, 907.80 and 395.89 is: 546.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.79 : 907.80 = 395.89 : x
  2. Step 2: Convert to fraction form
    657.79/907.80 = 395.89/x
  3. Step 3: Cross multiply
    657.79x = 907.80 × 395.89
  4. Step 4: Simplify right side
    657.79x = 359,388.94
  5. Step 5: Solve for x
    x = 359,388.94/657.79
  6. Step 6: Final answer
    x = 546.36

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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.