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Finding the Fourth Proportional to 257,415.30, 386,159.40 and 79,903.80

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Solution

The fourth proportional to 257,415.30, 386,159.40 and 79,903.80 is: 119,867.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,415.30 : 386,159.40 = 79,903.80 : x
  2. Step 2: Convert to fraction form
    257,415.30/386,159.40 = 79,903.80/x
  3. Step 3: Cross multiply
    257,415.30x = 386,159.40 × 79,903.80
  4. Step 4: Simplify right side
    257,415.30x = 30,855,603,465.72
  5. Step 5: Solve for x
    x = 30,855,603,465.72/257,415.30
  6. Step 6: Final answer
    x = 119,867.01

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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.