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Finding the Fourth Proportional to 1,011.72, 1,504.59 and 979.32

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Solution

The fourth proportional to 1,011.72, 1,504.59 and 979.32 is: 1,456.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.72 : 1,504.59 = 979.32 : x
  2. Step 2: Convert to fraction form
    1,011.72/1,504.59 = 979.32/x
  3. Step 3: Cross multiply
    1,011.72x = 1,504.59 × 979.32
  4. Step 4: Simplify right side
    1,011.72x = 1,473,475.08
  5. Step 5: Solve for x
    x = 1,473,475.08/1,011.72
  6. Step 6: Final answer
    x = 1,456.41

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.