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Finding the Fourth Proportional to 260,525.40, 390,690.90 and 102,721.20

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Solution

The fourth proportional to 260,525.40, 390,690.90 and 102,721.20 is: 154,043.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,525.40 : 390,690.90 = 102,721.20 : x
  2. Step 2: Convert to fraction form
    260,525.40/390,690.90 = 102,721.20/x
  3. Step 3: Cross multiply
    260,525.40x = 390,690.90 × 102,721.20
  4. Step 4: Simplify right side
    260,525.40x = 40,132,238,077.08
  5. Step 5: Solve for x
    x = 40,132,238,077.08/260,525.40
  6. Step 6: Final answer
    x = 154,043.48

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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.