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Finding the Fourth Proportional to 1,224.21, 1,689.76 and 776.16

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Solution

The fourth proportional to 1,224.21, 1,689.76 and 776.16 is: 1,071.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,224.21 : 1,689.76 = 776.16 : x
  2. Step 2: Convert to fraction form
    1,224.21/1,689.76 = 776.16/x
  3. Step 3: Cross multiply
    1,224.21x = 1,689.76 × 776.16
  4. Step 4: Simplify right side
    1,224.21x = 1,311,520.73
  5. Step 5: Solve for x
    x = 1,311,520.73/1,224.21
  6. Step 6: Final answer
    x = 1,071.32

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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.