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Finding the Fourth Proportional to 810.85, 1,120.75 and 591.34

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Solution

The fourth proportional to 810.85, 1,120.75 and 591.34 is: 817.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.85 : 1,120.75 = 591.34 : x
  2. Step 2: Convert to fraction form
    810.85/1,120.75 = 591.34/x
  3. Step 3: Cross multiply
    810.85x = 1,120.75 × 591.34
  4. Step 4: Simplify right side
    810.85x = 662,744.31
  5. Step 5: Solve for x
    x = 662,744.31/810.85
  6. Step 6: Final answer
    x = 817.35

Related Problems

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Half scale
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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.