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Finding the Fourth Proportional to 386,280.80, 579,421.20 and 136,930.40

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Solution

The fourth proportional to 386,280.80, 579,421.20 and 136,930.40 is: 205,395.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,280.80 : 579,421.20 = 136,930.40 : x
  2. Step 2: Convert to fraction form
    386,280.80/579,421.20 = 136,930.40/x
  3. Step 3: Cross multiply
    386,280.80x = 579,421.20 × 136,930.40
  4. Step 4: Simplify right side
    386,280.80x = 79,340,376,684.48
  5. Step 5: Solve for x
    x = 79,340,376,684.48/386,280.80
  6. Step 6: Final answer
    x = 205,395.60

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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.