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Finding the Fourth Proportional to 85,607.20, 128,420.40 and 26,442.40

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Solution

The fourth proportional to 85,607.20, 128,420.40 and 26,442.40 is: 39,666.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,607.20 : 128,420.40 = 26,442.40 : x
  2. Step 2: Convert to fraction form
    85,607.20/128,420.40 = 26,442.40/x
  3. Step 3: Cross multiply
    85,607.20x = 128,420.40 × 26,442.40
  4. Step 4: Simplify right side
    85,607.20x = 3,395,743,584.96
  5. Step 5: Solve for x
    x = 3,395,743,584.96/85,607.20
  6. Step 6: Final answer
    x = 39,666.57

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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.