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Finding the Fourth Proportional to 85,398.60, 128,031.57 and 55,349.40

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Solution

The fourth proportional to 85,398.60, 128,031.57 and 55,349.40 is: 82,981.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,398.60 : 128,031.57 = 55,349.40 : x
  2. Step 2: Convert to fraction form
    85,398.60/128,031.57 = 55,349.40/x
  3. Step 3: Cross multiply
    85,398.60x = 128,031.57 × 55,349.40
  4. Step 4: Simplify right side
    85,398.60x = 7,086,470,580.56
  5. Step 5: Solve for x
    x = 7,086,470,580.56/85,398.60
  6. Step 6: Final answer
    x = 82,981.11

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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.