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Finding the Fourth Proportional to 1,528.63, 2,109.51 and 830

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Solution

The fourth proportional to 1,528.63, 2,109.51 and 830 is: 1,145.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,528.63 : 2,109.51 = 830 : x
  2. Step 2: Convert to fraction form
    1,528.63/2,109.51 = 830/x
  3. Step 3: Cross multiply
    1,528.63x = 2,109.51 × 830
  4. Step 4: Simplify right side
    1,528.63x = 1,750,893.30
  5. Step 5: Solve for x
    x = 1,750,893.30/1,528.63
  6. Step 6: Final answer
    x = 1,145.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.