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Finding the Fourth Proportional to 779.39, 1,075.55 and 425.30

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Solution

The fourth proportional to 779.39, 1,075.55 and 425.30 is: 586.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.39 : 1,075.55 = 425.30 : x
  2. Step 2: Convert to fraction form
    779.39/1,075.55 = 425.30/x
  3. Step 3: Cross multiply
    779.39x = 1,075.55 × 425.30
  4. Step 4: Simplify right side
    779.39x = 457,429.29
  5. Step 5: Solve for x
    x = 457,429.29/779.39
  6. Step 6: Final answer
    x = 586.91

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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.