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Finding the Fourth Proportional to 930.56, 1,388.50 and 909.56

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Solution

The fourth proportional to 930.56, 1,388.50 and 909.56 is: 1,357.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.56 : 1,388.50 = 909.56 : x
  2. Step 2: Convert to fraction form
    930.56/1,388.50 = 909.56/x
  3. Step 3: Cross multiply
    930.56x = 1,388.50 × 909.56
  4. Step 4: Simplify right side
    930.56x = 1,262,924.06
  5. Step 5: Solve for x
    x = 1,262,924.06/930.56
  6. Step 6: Final answer
    x = 1,357.17

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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.