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Finding the Fourth Proportional to 570.81, 787.98 and 439.59

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Solution

The fourth proportional to 570.81, 787.98 and 439.59 is: 606.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    570.81 : 787.98 = 439.59 : x
  2. Step 2: Convert to fraction form
    570.81/787.98 = 439.59/x
  3. Step 3: Cross multiply
    570.81x = 787.98 × 439.59
  4. Step 4: Simplify right side
    570.81x = 346,390.26
  5. Step 5: Solve for x
    x = 346,390.26/570.81
  6. Step 6: Final answer
    x = 606.84

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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.