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Finding the Fourth Proportional to 779.32, 1,075.47 and 425.25

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Solution

The fourth proportional to 779.32, 1,075.47 and 425.25 is: 586.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.32 : 1,075.47 = 425.25 : x
  2. Step 2: Convert to fraction form
    779.32/1,075.47 = 425.25/x
  3. Step 3: Cross multiply
    779.32x = 1,075.47 × 425.25
  4. Step 4: Simplify right side
    779.32x = 457,343.62
  5. Step 5: Solve for x
    x = 457,343.62/779.32
  6. Step 6: Final answer
    x = 586.85

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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.