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Finding the Fourth Proportional to 953.12, 1,315.20 and 580.64

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Solution

The fourth proportional to 953.12, 1,315.20 and 580.64 is: 801.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    953.12 : 1,315.20 = 580.64 : x
  2. Step 2: Convert to fraction form
    953.12/1,315.20 = 580.64/x
  3. Step 3: Cross multiply
    953.12x = 1,315.20 × 580.64
  4. Step 4: Simplify right side
    953.12x = 763,657.73
  5. Step 5: Solve for x
    x = 763,657.73/953.12
  6. Step 6: Final answer
    x = 801.22

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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.