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Finding the Fourth Proportional to 710.52, 1,065.78 and 423.78

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Solution

The fourth proportional to 710.52, 1,065.78 and 423.78 is: 635.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.52 : 1,065.78 = 423.78 : x
  2. Step 2: Convert to fraction form
    710.52/1,065.78 = 423.78/x
  3. Step 3: Cross multiply
    710.52x = 1,065.78 × 423.78
  4. Step 4: Simplify right side
    710.52x = 451,656.25
  5. Step 5: Solve for x
    x = 451,656.25/710.52
  6. Step 6: Final answer
    x = 635.67

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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.