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Finding the Fourth Proportional to 875.37, 1,207.89 and 521.19

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Solution

The fourth proportional to 875.37, 1,207.89 and 521.19 is: 719.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.37 : 1,207.89 = 521.19 : x
  2. Step 2: Convert to fraction form
    875.37/1,207.89 = 521.19/x
  3. Step 3: Cross multiply
    875.37x = 1,207.89 × 521.19
  4. Step 4: Simplify right side
    875.37x = 629,540.19
  5. Step 5: Solve for x
    x = 629,540.19/875.37
  6. Step 6: Final answer
    x = 719.17

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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.