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Finding the Fourth Proportional to 976.79, 1,465.16 and 456.60

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Solution

The fourth proportional to 976.79, 1,465.16 and 456.60 is: 684.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.79 : 1,465.16 = 456.60 : x
  2. Step 2: Convert to fraction form
    976.79/1,465.16 = 456.60/x
  3. Step 3: Cross multiply
    976.79x = 1,465.16 × 456.60
  4. Step 4: Simplify right side
    976.79x = 668,995.27
  5. Step 5: Solve for x
    x = 668,995.27/976.79
  6. Step 6: Final answer
    x = 684.89

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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.