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Finding the Fourth Proportional to 438,318.80, 657,478.20 and 189,000.80

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Solution

The fourth proportional to 438,318.80, 657,478.20 and 189,000.80 is: 283,501.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,318.80 : 657,478.20 = 189,000.80 : x
  2. Step 2: Convert to fraction form
    438,318.80/657,478.20 = 189,000.80/x
  3. Step 3: Cross multiply
    438,318.80x = 657,478.20 × 189,000.80
  4. Step 4: Simplify right side
    438,318.80x = 124,263,905,782.56
  5. Step 5: Solve for x
    x = 124,263,905,782.56/438,318.80
  6. Step 6: Final answer
    x = 283,501.20

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Similar ratio
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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.