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Finding the Fourth Proportional to 985.84, 1,477.67 and 870.56

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Solution

The fourth proportional to 985.84, 1,477.67 and 870.56 is: 1,304.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.84 : 1,477.67 = 870.56 : x
  2. Step 2: Convert to fraction form
    985.84/1,477.67 = 870.56/x
  3. Step 3: Cross multiply
    985.84x = 1,477.67 × 870.56
  4. Step 4: Simplify right side
    985.84x = 1,286,400.40
  5. Step 5: Solve for x
    x = 1,286,400.40/985.84
  6. Step 6: Final answer
    x = 1,304.88

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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.