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Finding the Fourth Proportional to 259,686.80, 389,530.20 and 147,712.40

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Solution

The fourth proportional to 259,686.80, 389,530.20 and 147,712.40 is: 221,568.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,686.80 : 389,530.20 = 147,712.40 : x
  2. Step 2: Convert to fraction form
    259,686.80/389,530.20 = 147,712.40/x
  3. Step 3: Cross multiply
    259,686.80x = 389,530.20 × 147,712.40
  4. Step 4: Simplify right side
    259,686.80x = 57,538,440,714.48
  5. Step 5: Solve for x
    x = 57,538,440,714.48/259,686.80
  6. Step 6: Final answer
    x = 221,568.60

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1.5x scale

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.