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Finding the Fourth Proportional to 258,509.04, 387,734.40 and 90,000.96

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Solution

The fourth proportional to 258,509.04, 387,734.40 and 90,000.96 is: 134,991.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,509.04 : 387,734.40 = 90,000.96 : x
  2. Step 2: Convert to fraction form
    258,509.04/387,734.40 = 90,000.96/x
  3. Step 3: Cross multiply
    258,509.04x = 387,734.40 × 90,000.96
  4. Step 4: Simplify right side
    258,509.04x = 34,896,468,225.02
  5. Step 5: Solve for x
    x = 34,896,468,225.02/258,509.04
  6. Step 6: Final answer
    x = 134,991.29

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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.