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Finding the Fourth Proportional to 315,539.20, 473,078.40 and 128,454.40

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Solution

The fourth proportional to 315,539.20, 473,078.40 and 128,454.40 is: 192,587.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,539.20 : 473,078.40 = 128,454.40 : x
  2. Step 2: Convert to fraction form
    315,539.20/473,078.40 = 128,454.40/x
  3. Step 3: Cross multiply
    315,539.20x = 473,078.40 × 128,454.40
  4. Step 4: Simplify right side
    315,539.20x = 60,769,002,024.96
  5. Step 5: Solve for x
    x = 60,769,002,024.96/315,539.20
  6. Step 6: Final answer
    x = 192,587.81

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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.