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Finding the Fourth Proportional to 85,518.68, 128,291.78 and 26,354.32

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Solution

The fourth proportional to 85,518.68, 128,291.78 and 26,354.32 is: 39,535.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,518.68 : 128,291.78 = 26,354.32 : x
  2. Step 2: Convert to fraction form
    85,518.68/128,291.78 = 26,354.32/x
  3. Step 3: Cross multiply
    85,518.68x = 128,291.78 × 26,354.32
  4. Step 4: Simplify right side
    85,518.68x = 3,381,042,368.65
  5. Step 5: Solve for x
    x = 3,381,042,368.65/85,518.68
  6. Step 6: Final answer
    x = 39,535.72

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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.