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Finding the Fourth Proportional to 859.75, 1,186.50 and 505.69

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Solution

The fourth proportional to 859.75, 1,186.50 and 505.69 is: 697.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.75 : 1,186.50 = 505.69 : x
  2. Step 2: Convert to fraction form
    859.75/1,186.50 = 505.69/x
  3. Step 3: Cross multiply
    859.75x = 1,186.50 × 505.69
  4. Step 4: Simplify right side
    859.75x = 600,001.19
  5. Step 5: Solve for x
    x = 600,001.19/859.75
  6. Step 6: Final answer
    x = 697.88

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.