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Finding the Fourth Proportional to 686.34, 946.48 and 499.51

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Solution

The fourth proportional to 686.34, 946.48 and 499.51 is: 688.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.34 : 946.48 = 499.51 : x
  2. Step 2: Convert to fraction form
    686.34/946.48 = 499.51/x
  3. Step 3: Cross multiply
    686.34x = 946.48 × 499.51
  4. Step 4: Simplify right side
    686.34x = 472,771.50
  5. Step 5: Solve for x
    x = 472,771.50/686.34
  6. Step 6: Final answer
    x = 688.83

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1.5x scale

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.