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Finding the Fourth Proportional to 918.98, 1,378.65 and 670.01

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Solution

The fourth proportional to 918.98, 1,378.65 and 670.01 is: 1,005.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.98 : 1,378.65 = 670.01 : x
  2. Step 2: Convert to fraction form
    918.98/1,378.65 = 670.01/x
  3. Step 3: Cross multiply
    918.98x = 1,378.65 × 670.01
  4. Step 4: Simplify right side
    918.98x = 923,709.29
  5. Step 5: Solve for x
    x = 923,709.29/918.98
  6. Step 6: Final answer
    x = 1,005.15

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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.