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Finding the Fourth Proportional to 875.10, 1,312.46 and 412.68

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Solution

The fourth proportional to 875.10, 1,312.46 and 412.68 is: 618.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.10 : 1,312.46 = 412.68 : x
  2. Step 2: Convert to fraction form
    875.10/1,312.46 = 412.68/x
  3. Step 3: Cross multiply
    875.10x = 1,312.46 × 412.68
  4. Step 4: Simplify right side
    875.10x = 541,620.46
  5. Step 5: Solve for x
    x = 541,620.46/875.10
  6. Step 6: Final answer
    x = 618.93

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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.