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Finding the Fourth Proportional to 875.41, 1,205.89 and 709.17

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Solution

The fourth proportional to 875.41, 1,205.89 and 709.17 is: 976.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.41 : 1,205.89 = 709.17 : x
  2. Step 2: Convert to fraction form
    875.41/1,205.89 = 709.17/x
  3. Step 3: Cross multiply
    875.41x = 1,205.89 × 709.17
  4. Step 4: Simplify right side
    875.41x = 855,181.01
  5. Step 5: Solve for x
    x = 855,181.01/875.41
  6. Step 6: Final answer
    x = 976.89

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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.