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Finding the Fourth Proportional to 85,977.60, 128,966.40 and 54,484.80

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Solution

The fourth proportional to 85,977.60, 128,966.40 and 54,484.80 is: 81,727.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,977.60 : 128,966.40 = 54,484.80 : x
  2. Step 2: Convert to fraction form
    85,977.60/128,966.40 = 54,484.80/x
  3. Step 3: Cross multiply
    85,977.60x = 128,966.40 × 54,484.80
  4. Step 4: Simplify right side
    85,977.60x = 7,026,708,510.72
  5. Step 5: Solve for x
    x = 7,026,708,510.72/85,977.60
  6. Step 6: Final answer
    x = 81,727.20

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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.