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Finding the Fourth Proportional to 776.50, 1,071.70 and 477.68

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Solution

The fourth proportional to 776.50, 1,071.70 and 477.68 is: 659.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.50 : 1,071.70 = 477.68 : x
  2. Step 2: Convert to fraction form
    776.50/1,071.70 = 477.68/x
  3. Step 3: Cross multiply
    776.50x = 1,071.70 × 477.68
  4. Step 4: Simplify right side
    776.50x = 511,929.66
  5. Step 5: Solve for x
    x = 511,929.66/776.50
  6. Step 6: Final answer
    x = 659.28

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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.