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Finding the Fourth Proportional to 1,071.40, 1,478.46 and 678.55

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Solution

The fourth proportional to 1,071.40, 1,478.46 and 678.55 is: 936.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071.40 : 1,478.46 = 678.55 : x
  2. Step 2: Convert to fraction form
    1,071.40/1,478.46 = 678.55/x
  3. Step 3: Cross multiply
    1,071.40x = 1,478.46 × 678.55
  4. Step 4: Simplify right side
    1,071.40x = 1,003,207.88
  5. Step 5: Solve for x
    x = 1,003,207.88/1,071.40
  6. Step 6: Final answer
    x = 936.35

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.