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Finding the Fourth Proportional to 318,501.20, 477,751.80 and 128,961.20

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Solution

The fourth proportional to 318,501.20, 477,751.80 and 128,961.20 is: 193,441.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,501.20 : 477,751.80 = 128,961.20 : x
  2. Step 2: Convert to fraction form
    318,501.20/477,751.80 = 128,961.20/x
  3. Step 3: Cross multiply
    318,501.20x = 477,751.80 × 128,961.20
  4. Step 4: Simplify right side
    318,501.20x = 61,611,445,430.16
  5. Step 5: Solve for x
    x = 61,611,445,430.16/318,501.20
  6. Step 6: Final answer
    x = 193,441.80

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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.