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Finding the Fourth Proportional to 1,357.43, 2,035.26 and 870.89

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Solution

The fourth proportional to 1,357.43, 2,035.26 and 870.89 is: 1,305.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,357.43 : 2,035.26 = 870.89 : x
  2. Step 2: Convert to fraction form
    1,357.43/2,035.26 = 870.89/x
  3. Step 3: Cross multiply
    1,357.43x = 2,035.26 × 870.89
  4. Step 4: Simplify right side
    1,357.43x = 1,772,477.41
  5. Step 5: Solve for x
    x = 1,772,477.41/1,357.43
  6. Step 6: Final answer
    x = 1,305.76

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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.