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Finding the Fourth Proportional to 862.30, 1,189.96 and 469.34

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Solution

The fourth proportional to 862.30, 1,189.96 and 469.34 is: 647.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.30 : 1,189.96 = 469.34 : x
  2. Step 2: Convert to fraction form
    862.30/1,189.96 = 469.34/x
  3. Step 3: Cross multiply
    862.30x = 1,189.96 × 469.34
  4. Step 4: Simplify right side
    862.30x = 558,495.83
  5. Step 5: Solve for x
    x = 558,495.83/862.30
  6. Step 6: Final answer
    x = 647.68

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1.5x scale

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.