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Finding the Fourth Proportional to 85,605.40, 128,421.78 and 26,427.16

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Solution

The fourth proportional to 85,605.40, 128,421.78 and 26,427.16 is: 39,644.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,605.40 : 128,421.78 = 26,427.16 : x
  2. Step 2: Convert to fraction form
    85,605.40/128,421.78 = 26,427.16/x
  3. Step 3: Cross multiply
    85,605.40x = 128,421.78 × 26,427.16
  4. Step 4: Simplify right side
    85,605.40x = 3,393,822,927.54
  5. Step 5: Solve for x
    x = 3,393,822,927.54/85,605.40
  6. Step 6: Final answer
    x = 39,644.96

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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.