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Finding the Fourth Proportional to 818.30, 1,129.30 and 469.10

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Solution

The fourth proportional to 818.30, 1,129.30 and 469.10 is: 647.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.30 : 1,129.30 = 469.10 : x
  2. Step 2: Convert to fraction form
    818.30/1,129.30 = 469.10/x
  3. Step 3: Cross multiply
    818.30x = 1,129.30 × 469.10
  4. Step 4: Simplify right side
    818.30x = 529,747.81
  5. Step 5: Solve for x
    x = 529,747.81/818.30
  6. Step 6: Final answer
    x = 647.38

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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.