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Finding the Fourth Proportional to 1,104.60, 1,524.40 and 638.76

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Solution

The fourth proportional to 1,104.60, 1,524.40 and 638.76 is: 881.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,104.60 : 1,524.40 = 638.76 : x
  2. Step 2: Convert to fraction form
    1,104.60/1,524.40 = 638.76/x
  3. Step 3: Cross multiply
    1,104.60x = 1,524.40 × 638.76
  4. Step 4: Simplify right side
    1,104.60x = 973,725.74
  5. Step 5: Solve for x
    x = 973,725.74/1,104.60
  6. Step 6: Final answer
    x = 881.52

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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.