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Finding the Fourth Proportional to 745.58, 1,030.12 and 620.84

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Solution

The fourth proportional to 745.58, 1,030.12 and 620.84 is: 857.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.58 : 1,030.12 = 620.84 : x
  2. Step 2: Convert to fraction form
    745.58/1,030.12 = 620.84/x
  3. Step 3: Cross multiply
    745.58x = 1,030.12 × 620.84
  4. Step 4: Simplify right side
    745.58x = 639,539.70
  5. Step 5: Solve for x
    x = 639,539.70/745.58
  6. Step 6: Final answer
    x = 857.77

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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.