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Finding the Fourth Proportional to 953.56, 1,315.95 and 720.28

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Solution

The fourth proportional to 953.56, 1,315.95 and 720.28 is: 994.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    953.56 : 1,315.95 = 720.28 : x
  2. Step 2: Convert to fraction form
    953.56/1,315.95 = 720.28/x
  3. Step 3: Cross multiply
    953.56x = 1,315.95 × 720.28
  4. Step 4: Simplify right side
    953.56x = 947,852.47
  5. Step 5: Solve for x
    x = 947,852.47/953.56
  6. Step 6: Final answer
    x = 994.01

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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.