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Finding the Fourth Proportional to 935.70, 1,410.45 and 911.40

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Solution

The fourth proportional to 935.70, 1,410.45 and 911.40 is: 1,373.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.70 : 1,410.45 = 911.40 : x
  2. Step 2: Convert to fraction form
    935.70/1,410.45 = 911.40/x
  3. Step 3: Cross multiply
    935.70x = 1,410.45 × 911.40
  4. Step 4: Simplify right side
    935.70x = 1,285,484.13
  5. Step 5: Solve for x
    x = 1,285,484.13/935.70
  6. Step 6: Final answer
    x = 1,373.82

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.