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Finding the Fourth Proportional to 85,290.78, 127,688.38 and 49,643.29

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Solution

The fourth proportional to 85,290.78, 127,688.38 and 49,643.29 is: 74,320.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,290.78 : 127,688.38 = 49,643.29 : x
  2. Step 2: Convert to fraction form
    85,290.78/127,688.38 = 49,643.29/x
  3. Step 3: Cross multiply
    85,290.78x = 127,688.38 × 49,643.29
  4. Step 4: Simplify right side
    85,290.78x = 6,338,870,834.64
  5. Step 5: Solve for x
    x = 6,338,870,834.64/85,290.78
  6. Step 6: Final answer
    x = 74,320.70

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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.