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Finding the Fourth Proportional to 1,487.60, 2,052.78 and 824.40

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Solution

The fourth proportional to 1,487.60, 2,052.78 and 824.40 is: 1,137.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,487.60 : 2,052.78 = 824.40 : x
  2. Step 2: Convert to fraction form
    1,487.60/2,052.78 = 824.40/x
  3. Step 3: Cross multiply
    1,487.60x = 2,052.78 × 824.40
  4. Step 4: Simplify right side
    1,487.60x = 1,692,305.00
  5. Step 5: Solve for x
    x = 1,692,305.00/1,487.60
  6. Step 6: Final answer
    x = 1,137.61

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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.