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Finding the Fourth Proportional to 784.39, 1,082.34 and 469.58

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Solution

The fourth proportional to 784.39, 1,082.34 and 469.58 is: 647.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.39 : 1,082.34 = 469.58 : x
  2. Step 2: Convert to fraction form
    784.39/1,082.34 = 469.58/x
  3. Step 3: Cross multiply
    784.39x = 1,082.34 × 469.58
  4. Step 4: Simplify right side
    784.39x = 508,237.46
  5. Step 5: Solve for x
    x = 508,237.46/784.39
  6. Step 6: Final answer
    x = 647.94

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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.