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Finding the Fourth Proportional to 810.32, 1,216.12 and 425.68

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Solution

The fourth proportional to 810.32, 1,216.12 and 425.68 is: 638.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.32 : 1,216.12 = 425.68 : x
  2. Step 2: Convert to fraction form
    810.32/1,216.12 = 425.68/x
  3. Step 3: Cross multiply
    810.32x = 1,216.12 × 425.68
  4. Step 4: Simplify right side
    810.32x = 517,677.96
  5. Step 5: Solve for x
    x = 517,677.96/810.32
  6. Step 6: Final answer
    x = 638.86

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1.5x scale

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.