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Finding the Fourth Proportional to 1,019,905.20, 1,529,857.80 and 918,428.40

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Solution

The fourth proportional to 1,019,905.20, 1,529,857.80 and 918,428.40 is: 1,377,642.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,019,905.20 : 1,529,857.80 = 918,428.40 : x
  2. Step 2: Convert to fraction form
    1,019,905.20/1,529,857.80 = 918,428.40/x
  3. Step 3: Cross multiply
    1,019,905.20x = 1,529,857.80 × 918,428.40
  4. Step 4: Simplify right side
    1,019,905.20x = 1,405,064,851,481.52
  5. Step 5: Solve for x
    x = 1,405,064,851,481.52/1,019,905.20
  6. Step 6: Final answer
    x = 1,377,642.60

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Similar ratio
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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.