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Finding the Fourth Proportional to 779.70, 1,075.96 and 430.36

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Solution

The fourth proportional to 779.70, 1,075.96 and 430.36 is: 593.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.70 : 1,075.96 = 430.36 : x
  2. Step 2: Convert to fraction form
    779.70/1,075.96 = 430.36/x
  3. Step 3: Cross multiply
    779.70x = 1,075.96 × 430.36
  4. Step 4: Simplify right side
    779.70x = 463,050.15
  5. Step 5: Solve for x
    x = 463,050.15/779.70
  6. Step 6: Final answer
    x = 593.88

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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.