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Finding the Fourth Proportional to 943.76, 1,302.40 and 570.78

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Solution

The fourth proportional to 943.76, 1,302.40 and 570.78 is: 787.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    943.76 : 1,302.40 = 570.78 : x
  2. Step 2: Convert to fraction form
    943.76/1,302.40 = 570.78/x
  3. Step 3: Cross multiply
    943.76x = 1,302.40 × 570.78
  4. Step 4: Simplify right side
    943.76x = 743,383.87
  5. Step 5: Solve for x
    x = 743,383.87/943.76
  6. Step 6: Final answer
    x = 787.68

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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.