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Finding the Fourth Proportional to 715.32, 1,071.36 and 455.32

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Solution

The fourth proportional to 715.32, 1,071.36 and 455.32 is: 681.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.32 : 1,071.36 = 455.32 : x
  2. Step 2: Convert to fraction form
    715.32/1,071.36 = 455.32/x
  3. Step 3: Cross multiply
    715.32x = 1,071.36 × 455.32
  4. Step 4: Simplify right side
    715.32x = 487,811.64
  5. Step 5: Solve for x
    x = 487,811.64/715.32
  6. Step 6: Final answer
    x = 681.95

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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.