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Finding the Fourth Proportional to 1,005.12, 1,506.72 and 427.20

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Solution

The fourth proportional to 1,005.12, 1,506.72 and 427.20 is: 640.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.12 : 1,506.72 = 427.20 : x
  2. Step 2: Convert to fraction form
    1,005.12/1,506.72 = 427.20/x
  3. Step 3: Cross multiply
    1,005.12x = 1,506.72 × 427.20
  4. Step 4: Simplify right side
    1,005.12x = 643,670.78
  5. Step 5: Solve for x
    x = 643,670.78/1,005.12
  6. Step 6: Final answer
    x = 640.39

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.