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Finding the Fourth Proportional to 840.06, 1,263.78 and 719.76

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Solution

The fourth proportional to 840.06, 1,263.78 and 719.76 is: 1,082.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.06 : 1,263.78 = 719.76 : x
  2. Step 2: Convert to fraction form
    840.06/1,263.78 = 719.76/x
  3. Step 3: Cross multiply
    840.06x = 1,263.78 × 719.76
  4. Step 4: Simplify right side
    840.06x = 909,618.29
  5. Step 5: Solve for x
    x = 909,618.29/840.06
  6. Step 6: Final answer
    x = 1,082.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.