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Finding the Fourth Proportional to 1,473.70, 2,209.80 and 857.53

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Solution

The fourth proportional to 1,473.70, 2,209.80 and 857.53 is: 1,285.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,473.70 : 2,209.80 = 857.53 : x
  2. Step 2: Convert to fraction form
    1,473.70/2,209.80 = 857.53/x
  3. Step 3: Cross multiply
    1,473.70x = 2,209.80 × 857.53
  4. Step 4: Simplify right side
    1,473.70x = 1,894,969.79
  5. Step 5: Solve for x
    x = 1,894,969.79/1,473.70
  6. Step 6: Final answer
    x = 1,285.86

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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.