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Finding the Fourth Proportional to 1,385.81, 2,078.72 and 655.01

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Solution

The fourth proportional to 1,385.81, 2,078.72 and 655.01 is: 982.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.81 : 2,078.72 = 655.01 : x
  2. Step 2: Convert to fraction form
    1,385.81/2,078.72 = 655.01/x
  3. Step 3: Cross multiply
    1,385.81x = 2,078.72 × 655.01
  4. Step 4: Simplify right side
    1,385.81x = 1,361,582.39
  5. Step 5: Solve for x
    x = 1,361,582.39/1,385.81
  6. Step 6: Final answer
    x = 982.52

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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.