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Finding the Fourth Proportional to 976.88, 1,462.16 and 647.92

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Solution

The fourth proportional to 976.88, 1,462.16 and 647.92 is: 969.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.88 : 1,462.16 = 647.92 : x
  2. Step 2: Convert to fraction form
    976.88/1,462.16 = 647.92/x
  3. Step 3: Cross multiply
    976.88x = 1,462.16 × 647.92
  4. Step 4: Simplify right side
    976.88x = 947,362.71
  5. Step 5: Solve for x
    x = 947,362.71/976.88
  6. Step 6: Final answer
    x = 969.78

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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.