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Finding the Fourth Proportional to 570.90, 787.30 and 346.80

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Solution

The fourth proportional to 570.90, 787.30 and 346.80 is: 478.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    570.90 : 787.30 = 346.80 : x
  2. Step 2: Convert to fraction form
    570.90/787.30 = 346.80/x
  3. Step 3: Cross multiply
    570.90x = 787.30 × 346.80
  4. Step 4: Simplify right side
    570.90x = 273,035.64
  5. Step 5: Solve for x
    x = 273,035.64/570.90
  6. Step 6: Final answer
    x = 478.25

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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.