Home / 85,688.10-128,532.15-66,005.10

Finding the Fourth Proportional to 85,688.10, 128,532.15 and 66,005.10

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Solution

The fourth proportional to 85,688.10, 128,532.15 and 66,005.10 is: 99,007.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,688.10 : 128,532.15 = 66,005.10 : x
  2. Step 2: Convert to fraction form
    85,688.10/128,532.15 = 66,005.10/x
  3. Step 3: Cross multiply
    85,688.10x = 128,532.15 × 66,005.10
  4. Step 4: Simplify right side
    85,688.10x = 8,483,777,413.97
  5. Step 5: Solve for x
    x = 8,483,777,413.97/85,688.10
  6. Step 6: Final answer
    x = 99,007.65

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Similar ratio
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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.