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Finding the Fourth Proportional to 779.15, 1,075.28 and 480.47

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Solution

The fourth proportional to 779.15, 1,075.28 and 480.47 is: 663.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.15 : 1,075.28 = 480.47 : x
  2. Step 2: Convert to fraction form
    779.15/1,075.28 = 480.47/x
  3. Step 3: Cross multiply
    779.15x = 1,075.28 × 480.47
  4. Step 4: Simplify right side
    779.15x = 516,632.00
  5. Step 5: Solve for x
    x = 516,632.00/779.15
  6. Step 6: Final answer
    x = 663.07

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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.