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Finding the Fourth Proportional to 1,005.51, 1,508.04 and 485.49

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Solution

The fourth proportional to 1,005.51, 1,508.04 and 485.49 is: 728.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.51 : 1,508.04 = 485.49 : x
  2. Step 2: Convert to fraction form
    1,005.51/1,508.04 = 485.49/x
  3. Step 3: Cross multiply
    1,005.51x = 1,508.04 × 485.49
  4. Step 4: Simplify right side
    1,005.51x = 732,138.34
  5. Step 5: Solve for x
    x = 732,138.34/1,005.51
  6. Step 6: Final answer
    x = 728.13

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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.