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Finding the Fourth Proportional to 103,485.60, 155,228.40 and 85,989.60

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Solution

The fourth proportional to 103,485.60, 155,228.40 and 85,989.60 is: 128,984.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,485.60 : 155,228.40 = 85,989.60 : x
  2. Step 2: Convert to fraction form
    103,485.60/155,228.40 = 85,989.60/x
  3. Step 3: Cross multiply
    103,485.60x = 155,228.40 × 85,989.60
  4. Step 4: Simplify right side
    103,485.60x = 13,348,028,024.64
  5. Step 5: Solve for x
    x = 13,348,028,024.64/103,485.60
  6. Step 6: Final answer
    x = 128,984.40

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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.