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Finding the Fourth Proportional to 873.86, 1,205.79 and 500.75

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Solution

The fourth proportional to 873.86, 1,205.79 and 500.75 is: 690.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.86 : 1,205.79 = 500.75 : x
  2. Step 2: Convert to fraction form
    873.86/1,205.79 = 500.75/x
  3. Step 3: Cross multiply
    873.86x = 1,205.79 × 500.75
  4. Step 4: Simplify right side
    873.86x = 603,799.34
  5. Step 5: Solve for x
    x = 603,799.34/873.86
  6. Step 6: Final answer
    x = 690.96

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.