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Finding the Fourth Proportional to 85,340.32, 128,006.88 and 60,415.84

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Solution

The fourth proportional to 85,340.32, 128,006.88 and 60,415.84 is: 90,621.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,340.32 : 128,006.88 = 60,415.84 : x
  2. Step 2: Convert to fraction form
    85,340.32/128,006.88 = 60,415.84/x
  3. Step 3: Cross multiply
    85,340.32x = 128,006.88 × 60,415.84
  4. Step 4: Simplify right side
    85,340.32x = 7,733,643,180.98
  5. Step 5: Solve for x
    x = 7,733,643,180.98/85,340.32
  6. Step 6: Final answer
    x = 90,621.21

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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.