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Finding the Fourth Proportional to 85,852.80, 128,414.70 and 77,031.90

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Solution

The fourth proportional to 85,852.80, 128,414.70 and 77,031.90 is: 115,220.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,852.80 : 128,414.70 = 77,031.90 : x
  2. Step 2: Convert to fraction form
    85,852.80/128,414.70 = 77,031.90/x
  3. Step 3: Cross multiply
    85,852.80x = 128,414.70 × 77,031.90
  4. Step 4: Simplify right side
    85,852.80x = 9,892,028,328.93
  5. Step 5: Solve for x
    x = 9,892,028,328.93/85,852.80
  6. Step 6: Final answer
    x = 115,220.80

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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.