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Finding the Fourth Proportional to 890.68, 1,334.84 and 427.50

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Solution

The fourth proportional to 890.68, 1,334.84 and 427.50 is: 640.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.68 : 1,334.84 = 427.50 : x
  2. Step 2: Convert to fraction form
    890.68/1,334.84 = 427.50/x
  3. Step 3: Cross multiply
    890.68x = 1,334.84 × 427.50
  4. Step 4: Simplify right side
    890.68x = 570,644.10
  5. Step 5: Solve for x
    x = 570,644.10/890.68
  6. Step 6: Final answer
    x = 640.68

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1.5x scale

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.