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Finding the Fourth Proportional to 875.27, 1,312.15 and 412.73

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Solution

The fourth proportional to 875.27, 1,312.15 and 412.73 is: 618.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.27 : 1,312.15 = 412.73 : x
  2. Step 2: Convert to fraction form
    875.27/1,312.15 = 412.73/x
  3. Step 3: Cross multiply
    875.27x = 1,312.15 × 412.73
  4. Step 4: Simplify right side
    875.27x = 541,557.11
  5. Step 5: Solve for x
    x = 541,557.11/875.27
  6. Step 6: Final answer
    x = 618.73

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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.