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Finding the Fourth Proportional to 258,017.60, 387,026.40 and 156,978.20

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Solution

The fourth proportional to 258,017.60, 387,026.40 and 156,978.20 is: 235,467.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,017.60 : 387,026.40 = 156,978.20 : x
  2. Step 2: Convert to fraction form
    258,017.60/387,026.40 = 156,978.20/x
  3. Step 3: Cross multiply
    258,017.60x = 387,026.40 × 156,978.20
  4. Step 4: Simplify right side
    258,017.60x = 60,754,707,624.48
  5. Step 5: Solve for x
    x = 60,754,707,624.48/258,017.60
  6. Step 6: Final answer
    x = 235,467.30

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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.