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Finding the Fourth Proportional to 870.84, 1,202.72 and 816.57

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Solution

The fourth proportional to 870.84, 1,202.72 and 816.57 is: 1,127.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.84 : 1,202.72 = 816.57 : x
  2. Step 2: Convert to fraction form
    870.84/1,202.72 = 816.57/x
  3. Step 3: Cross multiply
    870.84x = 1,202.72 × 816.57
  4. Step 4: Simplify right side
    870.84x = 982,100.99
  5. Step 5: Solve for x
    x = 982,100.99/870.84
  6. Step 6: Final answer
    x = 1,127.76

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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.