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Finding the Fourth Proportional to 1,385.08, 2,076.59 and 654.24

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Solution

The fourth proportional to 1,385.08, 2,076.59 and 654.24 is: 980.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.08 : 2,076.59 = 654.24 : x
  2. Step 2: Convert to fraction form
    1,385.08/2,076.59 = 654.24/x
  3. Step 3: Cross multiply
    1,385.08x = 2,076.59 × 654.24
  4. Step 4: Simplify right side
    1,385.08x = 1,358,588.24
  5. Step 5: Solve for x
    x = 1,358,588.24/1,385.08
  6. Step 6: Final answer
    x = 980.87

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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.