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Finding the Fourth Proportional to 387,070.40, 579,439.20 and 340,414.40

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Solution

The fourth proportional to 387,070.40, 579,439.20 and 340,414.40 is: 509,595.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,070.40 : 579,439.20 = 340,414.40 : x
  2. Step 2: Convert to fraction form
    387,070.40/579,439.20 = 340,414.40/x
  3. Step 3: Cross multiply
    387,070.40x = 579,439.20 × 340,414.40
  4. Step 4: Simplify right side
    387,070.40x = 197,249,447,604.48
  5. Step 5: Solve for x
    x = 197,249,447,604.48/387,070.40
  6. Step 6: Final answer
    x = 509,595.79

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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.