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Finding the Fourth Proportional to 1,219.68, 1,681.20 and 827.28

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Solution

The fourth proportional to 1,219.68, 1,681.20 and 827.28 is: 1,140.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,219.68 : 1,681.20 = 827.28 : x
  2. Step 2: Convert to fraction form
    1,219.68/1,681.20 = 827.28/x
  3. Step 3: Cross multiply
    1,219.68x = 1,681.20 × 827.28
  4. Step 4: Simplify right side
    1,219.68x = 1,390,823.14
  5. Step 5: Solve for x
    x = 1,390,823.14/1,219.68
  6. Step 6: Final answer
    x = 1,140.32

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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.