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Finding the Fourth Proportional to 875.27, 1,209.45 and 638.81

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Solution

The fourth proportional to 875.27, 1,209.45 and 638.81 is: 882.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.27 : 1,209.45 = 638.81 : x
  2. Step 2: Convert to fraction form
    875.27/1,209.45 = 638.81/x
  3. Step 3: Cross multiply
    875.27x = 1,209.45 × 638.81
  4. Step 4: Simplify right side
    875.27x = 772,602.71
  5. Step 5: Solve for x
    x = 772,602.71/875.27
  6. Step 6: Final answer
    x = 882.71

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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.