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Finding the Fourth Proportional to 280,052.64, 420,079.06 and 69,690.58

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Solution

The fourth proportional to 280,052.64, 420,079.06 and 69,690.58 is: 104,535.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,052.64 : 420,079.06 = 69,690.58 : x
  2. Step 2: Convert to fraction form
    280,052.64/420,079.06 = 69,690.58/x
  3. Step 3: Cross multiply
    280,052.64x = 420,079.06 × 69,690.58
  4. Step 4: Simplify right side
    280,052.64x = 29,275,552,374.17
  5. Step 5: Solve for x
    x = 29,275,552,374.17/280,052.64
  6. Step 6: Final answer
    x = 104,535.89

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.