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Finding the Fourth Proportional to 85,390.40, 128,104.80 and 26,228.80

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Solution

The fourth proportional to 85,390.40, 128,104.80 and 26,228.80 is: 39,349.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,390.40 : 128,104.80 = 26,228.80 : x
  2. Step 2: Convert to fraction form
    85,390.40/128,104.80 = 26,228.80/x
  3. Step 3: Cross multiply
    85,390.40x = 128,104.80 × 26,228.80
  4. Step 4: Simplify right side
    85,390.40x = 3,360,035,178.24
  5. Step 5: Solve for x
    x = 3,360,035,178.24/85,390.40
  6. Step 6: Final answer
    x = 39,349.10

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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.