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Finding the Fourth Proportional to 935.89, 1,291.97 and 657.59

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Solution

The fourth proportional to 935.89, 1,291.97 and 657.59 is: 907.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.89 : 1,291.97 = 657.59 : x
  2. Step 2: Convert to fraction form
    935.89/1,291.97 = 657.59/x
  3. Step 3: Cross multiply
    935.89x = 1,291.97 × 657.59
  4. Step 4: Simplify right side
    935.89x = 849,581.74
  5. Step 5: Solve for x
    x = 849,581.74/935.89
  6. Step 6: Final answer
    x = 907.78

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1.5x scale

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.