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Finding the Fourth Proportional to 745.31, 1,028.60 and 430.58

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Solution

The fourth proportional to 745.31, 1,028.60 and 430.58 is: 594.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.31 : 1,028.60 = 430.58 : x
  2. Step 2: Convert to fraction form
    745.31/1,028.60 = 430.58/x
  3. Step 3: Cross multiply
    745.31x = 1,028.60 × 430.58
  4. Step 4: Simplify right side
    745.31x = 442,887.29
  5. Step 5: Solve for x
    x = 442,887.29/745.31
  6. Step 6: Final answer
    x = 594.24

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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.