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Finding the Fourth Proportional to 669.54, 924.28 and 420.98

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Solution

The fourth proportional to 669.54, 924.28 and 420.98 is: 581.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.54 : 924.28 = 420.98 : x
  2. Step 2: Convert to fraction form
    669.54/924.28 = 420.98/x
  3. Step 3: Cross multiply
    669.54x = 924.28 × 420.98
  4. Step 4: Simplify right side
    669.54x = 389,103.39
  5. Step 5: Solve for x
    x = 389,103.39/669.54
  6. Step 6: Final answer
    x = 581.15

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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.