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Finding the Fourth Proportional to 85,101.48, 128,289.35 and 79,392.60

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Solution

The fourth proportional to 85,101.48, 128,289.35 and 79,392.60 is: 119,683.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,101.48 : 128,289.35 = 79,392.60 : x
  2. Step 2: Convert to fraction form
    85,101.48/128,289.35 = 79,392.60/x
  3. Step 3: Cross multiply
    85,101.48x = 128,289.35 × 79,392.60
  4. Step 4: Simplify right side
    85,101.48x = 10,185,225,048.81
  5. Step 5: Solve for x
    x = 10,185,225,048.81/85,101.48
  6. Step 6: Final answer
    x = 119,683.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.