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Finding the Fourth Proportional to 570.39, 787.13 and 308.40

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Solution

The fourth proportional to 570.39, 787.13 and 308.40 is: 425.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    570.39 : 787.13 = 308.40 : x
  2. Step 2: Convert to fraction form
    570.39/787.13 = 308.40/x
  3. Step 3: Cross multiply
    570.39x = 787.13 × 308.40
  4. Step 4: Simplify right side
    570.39x = 242,750.51
  5. Step 5: Solve for x
    x = 242,750.51/570.39
  6. Step 6: Final answer
    x = 425.59

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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.