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Finding the Fourth Proportional to 85,730.40, 128,725.20 and 66,031.20

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Solution

The fourth proportional to 85,730.40, 128,725.20 and 66,031.20 is: 99,146.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,730.40 : 128,725.20 = 66,031.20 : x
  2. Step 2: Convert to fraction form
    85,730.40/128,725.20 = 66,031.20/x
  3. Step 3: Cross multiply
    85,730.40x = 128,725.20 × 66,031.20
  4. Step 4: Simplify right side
    85,730.40x = 8,499,879,426.24
  5. Step 5: Solve for x
    x = 8,499,879,426.24/85,730.40
  6. Step 6: Final answer
    x = 99,146.62

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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.