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Finding the Fourth Proportional to 780.03, 1,075.36 and 558.58

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Solution

The fourth proportional to 780.03, 1,075.36 and 558.58 is: 770.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.03 : 1,075.36 = 558.58 : x
  2. Step 2: Convert to fraction form
    780.03/1,075.36 = 558.58/x
  3. Step 3: Cross multiply
    780.03x = 1,075.36 × 558.58
  4. Step 4: Simplify right side
    780.03x = 600,674.59
  5. Step 5: Solve for x
    x = 600,674.59/780.03
  6. Step 6: Final answer
    x = 770.07

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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.