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Finding the Fourth Proportional to 85,812.30, 128,718.45 and 71,232.30

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Solution

The fourth proportional to 85,812.30, 128,718.45 and 71,232.30 is: 106,848.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,812.30 : 128,718.45 = 71,232.30 : x
  2. Step 2: Convert to fraction form
    85,812.30/128,718.45 = 71,232.30/x
  3. Step 3: Cross multiply
    85,812.30x = 128,718.45 × 71,232.30
  4. Step 4: Simplify right side
    85,812.30x = 9,168,911,245.94
  5. Step 5: Solve for x
    x = 9,168,911,245.94/85,812.30
  6. Step 6: Final answer
    x = 106,848.45

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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.