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Finding the Fourth Proportional to 715.24, 986.95 and 420.67

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Solution

The fourth proportional to 715.24, 986.95 and 420.67 is: 580.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.24 : 986.95 = 420.67 : x
  2. Step 2: Convert to fraction form
    715.24/986.95 = 420.67/x
  3. Step 3: Cross multiply
    715.24x = 986.95 × 420.67
  4. Step 4: Simplify right side
    715.24x = 415,180.26
  5. Step 5: Solve for x
    x = 415,180.26/715.24
  6. Step 6: Final answer
    x = 580.48

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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.