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Finding the Fourth Proportional to 1,005.42, 1,507.51 and 485.40

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Solution

The fourth proportional to 1,005.42, 1,507.51 and 485.40 is: 727.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.42 : 1,507.51 = 485.40 : x
  2. Step 2: Convert to fraction form
    1,005.42/1,507.51 = 485.40/x
  3. Step 3: Cross multiply
    1,005.42x = 1,507.51 × 485.40
  4. Step 4: Simplify right side
    1,005.42x = 731,745.35
  5. Step 5: Solve for x
    x = 731,745.35/1,005.42
  6. Step 6: Final answer
    x = 727.80

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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.