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Finding the Fourth Proportional to 734.95, 1,014.38 and 420.20

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Solution

The fourth proportional to 734.95, 1,014.38 and 420.20 is: 579.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    734.95 : 1,014.38 = 420.20 : x
  2. Step 2: Convert to fraction form
    734.95/1,014.38 = 420.20/x
  3. Step 3: Cross multiply
    734.95x = 1,014.38 × 420.20
  4. Step 4: Simplify right side
    734.95x = 426,238.45
  5. Step 5: Solve for x
    x = 426,238.45/734.95
  6. Step 6: Final answer
    x = 579.96

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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.