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Finding the Fourth Proportional to 85,497.60, 128,246.40 and 79,276.80

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Solution

The fourth proportional to 85,497.60, 128,246.40 and 79,276.80 is: 118,915.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,497.60 : 128,246.40 = 79,276.80 : x
  2. Step 2: Convert to fraction form
    85,497.60/128,246.40 = 79,276.80/x
  3. Step 3: Cross multiply
    85,497.60x = 128,246.40 × 79,276.80
  4. Step 4: Simplify right side
    85,497.60x = 10,166,964,203.52
  5. Step 5: Solve for x
    x = 10,166,964,203.52/85,497.60
  6. Step 6: Final answer
    x = 118,915.20

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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.