Home / 315,211.40-472,817.10-128,126.60

Finding the Fourth Proportional to 315,211.40, 472,817.10 and 128,126.60

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Solution

The fourth proportional to 315,211.40, 472,817.10 and 128,126.60 is: 192,189.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,211.40 : 472,817.10 = 128,126.60 : x
  2. Step 2: Convert to fraction form
    315,211.40/472,817.10 = 128,126.60/x
  3. Step 3: Cross multiply
    315,211.40x = 472,817.10 × 128,126.60
  4. Step 4: Simplify right side
    315,211.40x = 60,580,447,444.86
  5. Step 5: Solve for x
    x = 60,580,447,444.86/315,211.40
  6. Step 6: Final answer
    x = 192,189.90

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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.