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Finding the Fourth Proportional to 918.99, 1,368.63 and 913.73

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Solution

The fourth proportional to 918.99, 1,368.63 and 913.73 is: 1,360.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.99 : 1,368.63 = 913.73 : x
  2. Step 2: Convert to fraction form
    918.99/1,368.63 = 913.73/x
  3. Step 3: Cross multiply
    918.99x = 1,368.63 × 913.73
  4. Step 4: Simplify right side
    918.99x = 1,250,551.45
  5. Step 5: Solve for x
    x = 1,250,551.45/918.99
  6. Step 6: Final answer
    x = 1,360.79

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.