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Finding the Fourth Proportional to 889.68, 1,228.20 and 678.12

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Solution

The fourth proportional to 889.68, 1,228.20 and 678.12 is: 936.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.68 : 1,228.20 = 678.12 : x
  2. Step 2: Convert to fraction form
    889.68/1,228.20 = 678.12/x
  3. Step 3: Cross multiply
    889.68x = 1,228.20 × 678.12
  4. Step 4: Simplify right side
    889.68x = 832,866.98
  5. Step 5: Solve for x
    x = 832,866.98/889.68
  6. Step 6: Final answer
    x = 936.14

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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.