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Finding the Fourth Proportional to 875.65, 1,311.71 and 406.46

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Solution

The fourth proportional to 875.65, 1,311.71 and 406.46 is: 608.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.65 : 1,311.71 = 406.46 : x
  2. Step 2: Convert to fraction form
    875.65/1,311.71 = 406.46/x
  3. Step 3: Cross multiply
    875.65x = 1,311.71 × 406.46
  4. Step 4: Simplify right side
    875.65x = 533,157.65
  5. Step 5: Solve for x
    x = 533,157.65/875.65
  6. Step 6: Final answer
    x = 608.87

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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.