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Finding the Fourth Proportional to 1,364.80, 2,045.92 and 1,120

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Solution

The fourth proportional to 1,364.80, 2,045.92 and 1,120 is: 1,678.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,364.80 : 2,045.92 = 1,120 : x
  2. Step 2: Convert to fraction form
    1,364.80/2,045.92 = 1,120/x
  3. Step 3: Cross multiply
    1,364.80x = 2,045.92 × 1,120
  4. Step 4: Simplify right side
    1,364.80x = 2,291,430.40
  5. Step 5: Solve for x
    x = 2,291,430.40/1,364.80
  6. Step 6: Final answer
    x = 1,678.95

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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.