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Finding the Fourth Proportional to 851.85, 1,175.57 and 553.21

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Solution

The fourth proportional to 851.85, 1,175.57 and 553.21 is: 763.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.85 : 1,175.57 = 553.21 : x
  2. Step 2: Convert to fraction form
    851.85/1,175.57 = 553.21/x
  3. Step 3: Cross multiply
    851.85x = 1,175.57 × 553.21
  4. Step 4: Simplify right side
    851.85x = 650,341.69
  5. Step 5: Solve for x
    x = 650,341.69/851.85
  6. Step 6: Final answer
    x = 763.45

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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.