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Finding the Fourth Proportional to 918.60, 1,377.47 and 356.00

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Solution

The fourth proportional to 918.60, 1,377.47 and 356.00 is: 533.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.60 : 1,377.47 = 356.00 : x
  2. Step 2: Convert to fraction form
    918.60/1,377.47 = 356.00/x
  3. Step 3: Cross multiply
    918.60x = 1,377.47 × 356.00
  4. Step 4: Simplify right side
    918.60x = 490,371.62
  5. Step 5: Solve for x
    x = 490,371.62/918.60
  6. Step 6: Final answer
    x = 533.82

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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.