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Finding the Fourth Proportional to 918.40, 1,384.80 and 886.40

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Solution

The fourth proportional to 918.40, 1,384.80 and 886.40 is: 1,336.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.40 : 1,384.80 = 886.40 : x
  2. Step 2: Convert to fraction form
    918.40/1,384.80 = 886.40/x
  3. Step 3: Cross multiply
    918.40x = 1,384.80 × 886.40
  4. Step 4: Simplify right side
    918.40x = 1,227,486.72
  5. Step 5: Solve for x
    x = 1,227,486.72/918.40
  6. Step 6: Final answer
    x = 1,336.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.