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Finding the Fourth Proportional to 912.24, 1,259.28 and 632.88

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Solution

The fourth proportional to 912.24, 1,259.28 and 632.88 is: 873.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.24 : 1,259.28 = 632.88 : x
  2. Step 2: Convert to fraction form
    912.24/1,259.28 = 632.88/x
  3. Step 3: Cross multiply
    912.24x = 1,259.28 × 632.88
  4. Step 4: Simplify right side
    912.24x = 796,973.13
  5. Step 5: Solve for x
    x = 796,973.13/912.24
  6. Step 6: Final answer
    x = 873.64

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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.