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Finding the Fourth Proportional to 810.34, 1,215.47 and 290.35

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Solution

The fourth proportional to 810.34, 1,215.47 and 290.35 is: 435.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.34 : 1,215.47 = 290.35 : x
  2. Step 2: Convert to fraction form
    810.34/1,215.47 = 290.35/x
  3. Step 3: Cross multiply
    810.34x = 1,215.47 × 290.35
  4. Step 4: Simplify right side
    810.34x = 352,913.96
  5. Step 5: Solve for x
    x = 352,913.96/810.34
  6. Step 6: Final answer
    x = 435.51

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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.