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Finding the Fourth Proportional to 776.64, 1,071.38 and 511.55

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Solution

The fourth proportional to 776.64, 1,071.38 and 511.55 is: 705.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.64 : 1,071.38 = 511.55 : x
  2. Step 2: Convert to fraction form
    776.64/1,071.38 = 511.55/x
  3. Step 3: Cross multiply
    776.64x = 1,071.38 × 511.55
  4. Step 4: Simplify right side
    776.64x = 548,056.52
  5. Step 5: Solve for x
    x = 548,056.52/776.64
  6. Step 6: Final answer
    x = 705.68

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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.