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Finding the Fourth Proportional to 1,390.56, 2,080.44 and 956.40

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Solution

The fourth proportional to 1,390.56, 2,080.44 and 956.40 is: 1,430.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.56 : 2,080.44 = 956.40 : x
  2. Step 2: Convert to fraction form
    1,390.56/2,080.44 = 956.40/x
  3. Step 3: Cross multiply
    1,390.56x = 2,080.44 × 956.40
  4. Step 4: Simplify right side
    1,390.56x = 1,989,732.82
  5. Step 5: Solve for x
    x = 1,989,732.82/1,390.56
  6. Step 6: Final answer
    x = 1,430.89

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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.