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Finding the Fourth Proportional to 918.79, 1,377.90 and 656.60

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Solution

The fourth proportional to 918.79, 1,377.90 and 656.60 is: 984.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.79 : 1,377.90 = 656.60 : x
  2. Step 2: Convert to fraction form
    918.79/1,377.90 = 656.60/x
  3. Step 3: Cross multiply
    918.79x = 1,377.90 × 656.60
  4. Step 4: Simplify right side
    918.79x = 904,729.14
  5. Step 5: Solve for x
    x = 904,729.14/918.79
  6. Step 6: Final answer
    x = 984.70

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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.