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Finding the Fourth Proportional to 315,079.40, 472,676.70 and 128,109.80

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Solution

The fourth proportional to 315,079.40, 472,676.70 and 128,109.80 is: 192,188.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,079.40 : 472,676.70 = 128,109.80 : x
  2. Step 2: Convert to fraction form
    315,079.40/472,676.70 = 128,109.80/x
  3. Step 3: Cross multiply
    315,079.40x = 472,676.70 × 128,109.80
  4. Step 4: Simplify right side
    315,079.40x = 60,554,517,501.66
  5. Step 5: Solve for x
    x = 60,554,517,501.66/315,079.40
  6. Step 6: Final answer
    x = 192,188.12

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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.