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Finding the Fourth Proportional to 779.70, 1,076 and 430.39

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Solution

The fourth proportional to 779.70, 1,076 and 430.39 is: 593.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.70 : 1,076 = 430.39 : x
  2. Step 2: Convert to fraction form
    779.70/1,076 = 430.39/x
  3. Step 3: Cross multiply
    779.70x = 1,076 × 430.39
  4. Step 4: Simplify right side
    779.70x = 463,099.64
  5. Step 5: Solve for x
    x = 463,099.64/779.70
  6. Step 6: Final answer
    x = 593.95

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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.