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Finding the Fourth Proportional to 828.90, 1,145.34 and 619.92

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Solution

The fourth proportional to 828.90, 1,145.34 and 619.92 is: 856.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.90 : 1,145.34 = 619.92 : x
  2. Step 2: Convert to fraction form
    828.90/1,145.34 = 619.92/x
  3. Step 3: Cross multiply
    828.90x = 1,145.34 × 619.92
  4. Step 4: Simplify right side
    828.90x = 710,019.17
  5. Step 5: Solve for x
    x = 710,019.17/828.90
  6. Step 6: Final answer
    x = 856.58

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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.