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Finding the Fourth Proportional to 545,415.40, 818,123.10 and 171,438.40

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Solution

The fourth proportional to 545,415.40, 818,123.10 and 171,438.40 is: 257,157.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    545,415.40 : 818,123.10 = 171,438.40 : x
  2. Step 2: Convert to fraction form
    545,415.40/818,123.10 = 171,438.40/x
  3. Step 3: Cross multiply
    545,415.40x = 818,123.10 × 171,438.40
  4. Step 4: Simplify right side
    545,415.40x = 140,257,715,267.04
  5. Step 5: Solve for x
    x = 140,257,715,267.04/545,415.40
  6. Step 6: Final answer
    x = 257,157.60

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Double scale
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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.