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Finding the Fourth Proportional to 1,009.02, 1,511.67 and 643.86

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Solution

The fourth proportional to 1,009.02, 1,511.67 and 643.86 is: 964.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.02 : 1,511.67 = 643.86 : x
  2. Step 2: Convert to fraction form
    1,009.02/1,511.67 = 643.86/x
  3. Step 3: Cross multiply
    1,009.02x = 1,511.67 × 643.86
  4. Step 4: Simplify right side
    1,009.02x = 973,303.85
  5. Step 5: Solve for x
    x = 973,303.85/1,009.02
  6. Step 6: Final answer
    x = 964.60

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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.