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Finding the Fourth Proportional to 657.83, 907.74 and 405.71

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Solution

The fourth proportional to 657.83, 907.74 and 405.71 is: 559.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.83 : 907.74 = 405.71 : x
  2. Step 2: Convert to fraction form
    657.83/907.74 = 405.71/x
  3. Step 3: Cross multiply
    657.83x = 907.74 × 405.71
  4. Step 4: Simplify right side
    657.83x = 368,279.20
  5. Step 5: Solve for x
    x = 368,279.20/657.83
  6. Step 6: Final answer
    x = 559.84

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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.