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Finding the Fourth Proportional to 745.32, 1,028.66 and 465.60

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Solution

The fourth proportional to 745.32, 1,028.66 and 465.60 is: 642.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.32 : 1,028.66 = 465.60 : x
  2. Step 2: Convert to fraction form
    745.32/1,028.66 = 465.60/x
  3. Step 3: Cross multiply
    745.32x = 1,028.66 × 465.60
  4. Step 4: Simplify right side
    745.32x = 478,941.77
  5. Step 5: Solve for x
    x = 478,941.77/745.32
  6. Step 6: Final answer
    x = 642.60

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1.5x scale

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.