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Finding the Fourth Proportional to 977.92, 1,349.64 and 646.32

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Solution

The fourth proportional to 977.92, 1,349.64 and 646.32 is: 891.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.92 : 1,349.64 = 646.32 : x
  2. Step 2: Convert to fraction form
    977.92/1,349.64 = 646.32/x
  3. Step 3: Cross multiply
    977.92x = 1,349.64 × 646.32
  4. Step 4: Simplify right side
    977.92x = 872,299.32
  5. Step 5: Solve for x
    x = 872,299.32/977.92
  6. Step 6: Final answer
    x = 891.99

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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.