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Finding the Fourth Proportional to 686.04, 946.50 and 420.48

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Solution

The fourth proportional to 686.04, 946.50 and 420.48 is: 580.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.04 : 946.50 = 420.48 : x
  2. Step 2: Convert to fraction form
    686.04/946.50 = 420.48/x
  3. Step 3: Cross multiply
    686.04x = 946.50 × 420.48
  4. Step 4: Simplify right side
    686.04x = 397,984.32
  5. Step 5: Solve for x
    x = 397,984.32/686.04
  6. Step 6: Final answer
    x = 580.12

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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.