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Finding the Fourth Proportional to 875.81, 1,208.39 and 502.81

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Solution

The fourth proportional to 875.81, 1,208.39 and 502.81 is: 693.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.81 : 1,208.39 = 502.81 : x
  2. Step 2: Convert to fraction form
    875.81/1,208.39 = 502.81/x
  3. Step 3: Cross multiply
    875.81x = 1,208.39 × 502.81
  4. Step 4: Simplify right side
    875.81x = 607,585.04
  5. Step 5: Solve for x
    x = 607,585.04/875.81
  6. Step 6: Final answer
    x = 693.74

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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.