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Finding the Fourth Proportional to 1,320.40, 1,976.76 and 885.20

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Solution

The fourth proportional to 1,320.40, 1,976.76 and 885.20 is: 1,325.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.40 : 1,976.76 = 885.20 : x
  2. Step 2: Convert to fraction form
    1,320.40/1,976.76 = 885.20/x
  3. Step 3: Cross multiply
    1,320.40x = 1,976.76 × 885.20
  4. Step 4: Simplify right side
    1,320.40x = 1,749,827.95
  5. Step 5: Solve for x
    x = 1,749,827.95/1,320.40
  6. Step 6: Final answer
    x = 1,325.23

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1.5x scale

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.