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Finding the Fourth Proportional to 851.79, 1,175.43 and 520.77

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Solution

The fourth proportional to 851.79, 1,175.43 and 520.77 is: 718.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.79 : 1,175.43 = 520.77 : x
  2. Step 2: Convert to fraction form
    851.79/1,175.43 = 520.77/x
  3. Step 3: Cross multiply
    851.79x = 1,175.43 × 520.77
  4. Step 4: Simplify right side
    851.79x = 612,122.80
  5. Step 5: Solve for x
    x = 612,122.80/851.79
  6. Step 6: Final answer
    x = 718.64

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Double scale
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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.