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Finding the Fourth Proportional to 260,139.60, 392,704.20 and 257,515.20

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Solution

The fourth proportional to 260,139.60, 392,704.20 and 257,515.20 is: 388,742.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,139.60 : 392,704.20 = 257,515.20 : x
  2. Step 2: Convert to fraction form
    260,139.60/392,704.20 = 257,515.20/x
  3. Step 3: Cross multiply
    260,139.60x = 392,704.20 × 257,515.20
  4. Step 4: Simplify right side
    260,139.60x = 101,127,300,603.84
  5. Step 5: Solve for x
    x = 101,127,300,603.84/260,139.60
  6. Step 6: Final answer
    x = 388,742.43

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.