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Finding the Fourth Proportional to 735.12, 1,014.38 and 420.40

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Solution

The fourth proportional to 735.12, 1,014.38 and 420.40 is: 580.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    735.12 : 1,014.38 = 420.40 : x
  2. Step 2: Convert to fraction form
    735.12/1,014.38 = 420.40/x
  3. Step 3: Cross multiply
    735.12x = 1,014.38 × 420.40
  4. Step 4: Simplify right side
    735.12x = 426,445.35
  5. Step 5: Solve for x
    x = 426,445.35/735.12
  6. Step 6: Final answer
    x = 580.10

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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.