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Finding the Fourth Proportional to 85,569.80, 128,181.90 and 48,590.60

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Solution

The fourth proportional to 85,569.80, 128,181.90 and 48,590.60 is: 72,787.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,569.80 : 128,181.90 = 48,590.60 : x
  2. Step 2: Convert to fraction form
    85,569.80/128,181.90 = 48,590.60/x
  3. Step 3: Cross multiply
    85,569.80x = 128,181.90 × 48,590.60
  4. Step 4: Simplify right side
    85,569.80x = 6,228,435,430.14
  5. Step 5: Solve for x
    x = 6,228,435,430.14/85,569.80
  6. Step 6: Final answer
    x = 72,787.78

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1.5x scale

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.