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Finding the Fourth Proportional to 851.60, 1,173.48 and 630.20

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Solution

The fourth proportional to 851.60, 1,173.48 and 630.20 is: 868.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.60 : 1,173.48 = 630.20 : x
  2. Step 2: Convert to fraction form
    851.60/1,173.48 = 630.20/x
  3. Step 3: Cross multiply
    851.60x = 1,173.48 × 630.20
  4. Step 4: Simplify right side
    851.60x = 739,527.10
  5. Step 5: Solve for x
    x = 739,527.10/851.60
  6. Step 6: Final answer
    x = 868.40

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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.