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Finding the Fourth Proportional to 1,355.79, 2,036.93 and 869.79

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Solution

The fourth proportional to 1,355.79, 2,036.93 and 869.79 is: 1,306.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,355.79 : 2,036.93 = 869.79 : x
  2. Step 2: Convert to fraction form
    1,355.79/2,036.93 = 869.79/x
  3. Step 3: Cross multiply
    1,355.79x = 2,036.93 × 869.79
  4. Step 4: Simplify right side
    1,355.79x = 1,771,697.00
  5. Step 5: Solve for x
    x = 1,771,697.00/1,355.79
  6. Step 6: Final answer
    x = 1,306.76

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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.