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Finding the Fourth Proportional to 673.80, 928.68 and 507.72

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Solution

The fourth proportional to 673.80, 928.68 and 507.72 is: 699.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    673.80 : 928.68 = 507.72 : x
  2. Step 2: Convert to fraction form
    673.80/928.68 = 507.72/x
  3. Step 3: Cross multiply
    673.80x = 928.68 × 507.72
  4. Step 4: Simplify right side
    673.80x = 471,509.41
  5. Step 5: Solve for x
    x = 471,509.41/673.80
  6. Step 6: Final answer
    x = 699.78

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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.