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Finding the Fourth Proportional to 880.50, 1,215.12 and 570.54

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Solution

The fourth proportional to 880.50, 1,215.12 and 570.54 is: 787.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.50 : 1,215.12 = 570.54 : x
  2. Step 2: Convert to fraction form
    880.50/1,215.12 = 570.54/x
  3. Step 3: Cross multiply
    880.50x = 1,215.12 × 570.54
  4. Step 4: Simplify right side
    880.50x = 693,274.56
  5. Step 5: Solve for x
    x = 693,274.56/880.50
  6. Step 6: Final answer
    x = 787.36

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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.