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Finding the Fourth Proportional to 976.48, 1,465.17 and 428.59

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Solution

The fourth proportional to 976.48, 1,465.17 and 428.59 is: 643.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.48 : 1,465.17 = 428.59 : x
  2. Step 2: Convert to fraction form
    976.48/1,465.17 = 428.59/x
  3. Step 3: Cross multiply
    976.48x = 1,465.17 × 428.59
  4. Step 4: Simplify right side
    976.48x = 627,957.21
  5. Step 5: Solve for x
    x = 627,957.21/976.48
  6. Step 6: Final answer
    x = 643.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.