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Finding the Fourth Proportional to 779.18, 1,075.28 and 429.86

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Solution

The fourth proportional to 779.18, 1,075.28 and 429.86 is: 593.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.18 : 1,075.28 = 429.86 : x
  2. Step 2: Convert to fraction form
    779.18/1,075.28 = 429.86/x
  3. Step 3: Cross multiply
    779.18x = 1,075.28 × 429.86
  4. Step 4: Simplify right side
    779.18x = 462,219.86
  5. Step 5: Solve for x
    x = 462,219.86/779.18
  6. Step 6: Final answer
    x = 593.21

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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.