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Finding the Fourth Proportional to 870.84, 1,305.79 and 653.96

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Solution

The fourth proportional to 870.84, 1,305.79 and 653.96 is: 980.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.84 : 1,305.79 = 653.96 : x
  2. Step 2: Convert to fraction form
    870.84/1,305.79 = 653.96/x
  3. Step 3: Cross multiply
    870.84x = 1,305.79 × 653.96
  4. Step 4: Simplify right side
    870.84x = 853,936.06
  5. Step 5: Solve for x
    x = 853,936.06/870.84
  6. Step 6: Final answer
    x = 980.59

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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.