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Finding the Fourth Proportional to 875.35, 1,311.18 and 631.15

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Solution

The fourth proportional to 875.35, 1,311.18 and 631.15 is: 945.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.35 : 1,311.18 = 631.15 : x
  2. Step 2: Convert to fraction form
    875.35/1,311.18 = 631.15/x
  3. Step 3: Cross multiply
    875.35x = 1,311.18 × 631.15
  4. Step 4: Simplify right side
    875.35x = 827,551.26
  5. Step 5: Solve for x
    x = 827,551.26/875.35
  6. Step 6: Final answer
    x = 945.39

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.