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Finding the Fourth Proportional to 896.16, 1,236.08 and 631.15

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Solution

The fourth proportional to 896.16, 1,236.08 and 631.15 is: 870.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    896.16 : 1,236.08 = 631.15 : x
  2. Step 2: Convert to fraction form
    896.16/1,236.08 = 631.15/x
  3. Step 3: Cross multiply
    896.16x = 1,236.08 × 631.15
  4. Step 4: Simplify right side
    896.16x = 780,151.89
  5. Step 5: Solve for x
    x = 780,151.89/896.16
  6. Step 6: Final answer
    x = 870.55

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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.