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Finding the Fourth Proportional to 686.64, 948.24 and 570

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Solution

The fourth proportional to 686.64, 948.24 and 570 is: 787.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.64 : 948.24 = 570 : x
  2. Step 2: Convert to fraction form
    686.64/948.24 = 570/x
  3. Step 3: Cross multiply
    686.64x = 948.24 × 570
  4. Step 4: Simplify right side
    686.64x = 540,496.80
  5. Step 5: Solve for x
    x = 540,496.80/686.64
  6. Step 6: Final answer
    x = 787.16

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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.