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Finding the Fourth Proportional to 830.24, 1,145.45 and 515.32

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Solution

The fourth proportional to 830.24, 1,145.45 and 515.32 is: 710.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.24 : 1,145.45 = 515.32 : x
  2. Step 2: Convert to fraction form
    830.24/1,145.45 = 515.32/x
  3. Step 3: Cross multiply
    830.24x = 1,145.45 × 515.32
  4. Step 4: Simplify right side
    830.24x = 590,273.29
  5. Step 5: Solve for x
    x = 590,273.29/830.24
  6. Step 6: Final answer
    x = 710.97

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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.