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Finding the Fourth Proportional to 918.84, 1,370.40 and 886.44

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Solution

The fourth proportional to 918.84, 1,370.40 and 886.44 is: 1,322.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.84 : 1,370.40 = 886.44 : x
  2. Step 2: Convert to fraction form
    918.84/1,370.40 = 886.44/x
  3. Step 3: Cross multiply
    918.84x = 1,370.40 × 886.44
  4. Step 4: Simplify right side
    918.84x = 1,214,777.38
  5. Step 5: Solve for x
    x = 1,214,777.38/918.84
  6. Step 6: Final answer
    x = 1,322.08

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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.