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Finding the Fourth Proportional to 935.55, 1,389.75 and 919.35

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Solution

The fourth proportional to 935.55, 1,389.75 and 919.35 is: 1,365.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.55 : 1,389.75 = 919.35 : x
  2. Step 2: Convert to fraction form
    935.55/1,389.75 = 919.35/x
  3. Step 3: Cross multiply
    935.55x = 1,389.75 × 919.35
  4. Step 4: Simplify right side
    935.55x = 1,277,666.66
  5. Step 5: Solve for x
    x = 1,277,666.66/935.55
  6. Step 6: Final answer
    x = 1,365.69

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.