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Finding the Fourth Proportional to 1,009.12, 1,506.44 and 918.40

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Solution

The fourth proportional to 1,009.12, 1,506.44 and 918.40 is: 1,371.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.12 : 1,506.44 = 918.40 : x
  2. Step 2: Convert to fraction form
    1,009.12/1,506.44 = 918.40/x
  3. Step 3: Cross multiply
    1,009.12x = 1,506.44 × 918.40
  4. Step 4: Simplify right side
    1,009.12x = 1,383,514.50
  5. Step 5: Solve for x
    x = 1,383,514.50/1,009.12
  6. Step 6: Final answer
    x = 1,371.01

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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.