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Finding the Fourth Proportional to 258,617.79, 388,105.08 and 90,139.53

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Solution

The fourth proportional to 258,617.79, 388,105.08 and 90,139.53 is: 135,271.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,617.79 : 388,105.08 = 90,139.53 : x
  2. Step 2: Convert to fraction form
    258,617.79/388,105.08 = 90,139.53/x
  3. Step 3: Cross multiply
    258,617.79x = 388,105.08 × 90,139.53
  4. Step 4: Simplify right side
    258,617.79x = 34,983,609,501.81
  5. Step 5: Solve for x
    x = 34,983,609,501.81/258,617.79
  6. Step 6: Final answer
    x = 135,271.47

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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.