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Finding the Fourth Proportional to 1,071.60, 1,478.64 and 605.76

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Solution

The fourth proportional to 1,071.60, 1,478.64 and 605.76 is: 835.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071.60 : 1,478.64 = 605.76 : x
  2. Step 2: Convert to fraction form
    1,071.60/1,478.64 = 605.76/x
  3. Step 3: Cross multiply
    1,071.60x = 1,478.64 × 605.76
  4. Step 4: Simplify right side
    1,071.60x = 895,700.97
  5. Step 5: Solve for x
    x = 895,700.97/1,071.60
  6. Step 6: Final answer
    x = 835.85

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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.