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Finding the Fourth Proportional to 921.36, 1,373.84 and 904.98

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Solution

The fourth proportional to 921.36, 1,373.84 and 904.98 is: 1,349.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.36 : 1,373.84 = 904.98 : x
  2. Step 2: Convert to fraction form
    921.36/1,373.84 = 904.98/x
  3. Step 3: Cross multiply
    921.36x = 1,373.84 × 904.98
  4. Step 4: Simplify right side
    921.36x = 1,243,299.99
  5. Step 5: Solve for x
    x = 1,243,299.99/921.36
  6. Step 6: Final answer
    x = 1,349.42

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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.