Home / 85,440.15-128,172.48-26,280.81

Finding the Fourth Proportional to 85,440.15, 128,172.48 and 26,280.81

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Solution

The fourth proportional to 85,440.15, 128,172.48 and 26,280.81 is: 39,424.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,440.15 : 128,172.48 = 26,280.81 : x
  2. Step 2: Convert to fraction form
    85,440.15/128,172.48 = 26,280.81/x
  3. Step 3: Cross multiply
    85,440.15x = 128,172.48 × 26,280.81
  4. Step 4: Simplify right side
    85,440.15x = 3,368,476,594.11
  5. Step 5: Solve for x
    x = 3,368,476,594.11/85,440.15
  6. Step 6: Final answer
    x = 39,424.98

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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.