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Finding the Fourth Proportional to 570.60, 787.39 and 318.53

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Solution

The fourth proportional to 570.60, 787.39 and 318.53 is: 439.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    570.60 : 787.39 = 318.53 : x
  2. Step 2: Convert to fraction form
    570.60/787.39 = 318.53/x
  3. Step 3: Cross multiply
    570.60x = 787.39 × 318.53
  4. Step 4: Simplify right side
    570.60x = 250,808.51
  5. Step 5: Solve for x
    x = 250,808.51/570.60
  6. Step 6: Final answer
    x = 439.55

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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.