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Finding the Fourth Proportional to 543,485.70, 815,228.55 and 538,236.90

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Solution

The fourth proportional to 543,485.70, 815,228.55 and 538,236.90 is: 807,355.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    543,485.70 : 815,228.55 = 538,236.90 : x
  2. Step 2: Convert to fraction form
    543,485.70/815,228.55 = 538,236.90/x
  3. Step 3: Cross multiply
    543,485.70x = 815,228.55 × 538,236.90
  4. Step 4: Simplify right side
    543,485.70x = 438,786,087,543.50
  5. Step 5: Solve for x
    x = 438,786,087,543.50/543,485.70
  6. Step 6: Final answer
    x = 807,355.35

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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.