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Finding the Fourth Proportional to 754.20, 1,130.10 and 631.80

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Solution

The fourth proportional to 754.20, 1,130.10 and 631.80 is: 946.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.20 : 1,130.10 = 631.80 : x
  2. Step 2: Convert to fraction form
    754.20/1,130.10 = 631.80/x
  3. Step 3: Cross multiply
    754.20x = 1,130.10 × 631.80
  4. Step 4: Simplify right side
    754.20x = 713,997.18
  5. Step 5: Solve for x
    x = 713,997.18/754.20
  6. Step 6: Final answer
    x = 946.69

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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.