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Finding the Fourth Proportional to 1,019.40, 1,407.11 and 678.63

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Solution

The fourth proportional to 1,019.40, 1,407.11 and 678.63 is: 936.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,019.40 : 1,407.11 = 678.63 : x
  2. Step 2: Convert to fraction form
    1,019.40/1,407.11 = 678.63/x
  3. Step 3: Cross multiply
    1,019.40x = 1,407.11 × 678.63
  4. Step 4: Simplify right side
    1,019.40x = 954,907.06
  5. Step 5: Solve for x
    x = 954,907.06/1,019.40
  6. Step 6: Final answer
    x = 936.73

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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.