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Finding the Fourth Proportional to 2,865.69, 4,298.53 and 785.70

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Solution

The fourth proportional to 2,865.69, 4,298.53 and 785.70 is: 1,178.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,865.69 : 4,298.53 = 785.70 : x
  2. Step 2: Convert to fraction form
    2,865.69/4,298.53 = 785.70/x
  3. Step 3: Cross multiply
    2,865.69x = 4,298.53 × 785.70
  4. Step 4: Simplify right side
    2,865.69x = 3,377,355.02
  5. Step 5: Solve for x
    x = 3,377,355.02/2,865.69
  6. Step 6: Final answer
    x = 1,178.55

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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.