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Finding the Fourth Proportional to 1,120.40, 1,678.32 and 656.84

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Solution

The fourth proportional to 1,120.40, 1,678.32 and 656.84 is: 983.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.40 : 1,678.32 = 656.84 : x
  2. Step 2: Convert to fraction form
    1,120.40/1,678.32 = 656.84/x
  3. Step 3: Cross multiply
    1,120.40x = 1,678.32 × 656.84
  4. Step 4: Simplify right side
    1,120.40x = 1,102,387.71
  5. Step 5: Solve for x
    x = 1,102,387.71/1,120.40
  6. Step 6: Final answer
    x = 983.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.