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Finding the Fourth Proportional to 821.34, 1,224.11 and 786.71

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Solution

The fourth proportional to 821.34, 1,224.11 and 786.71 is: 1,172.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.34 : 1,224.11 = 786.71 : x
  2. Step 2: Convert to fraction form
    821.34/1,224.11 = 786.71/x
  3. Step 3: Cross multiply
    821.34x = 1,224.11 × 786.71
  4. Step 4: Simplify right side
    821.34x = 963,024.61
  5. Step 5: Solve for x
    x = 963,024.61/821.34
  6. Step 6: Final answer
    x = 1,172.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.