Home / 42,912,138.40-64,368,207.60-18,678,428.80

Finding the Fourth Proportional to 42,912,138.40, 64,368,207.60 and 18,678,428.80

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Solution

The fourth proportional to 42,912,138.40, 64,368,207.60 and 18,678,428.80 is: 28,017,643.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,912,138.40 : 64,368,207.60 = 18,678,428.80 : x
  2. Step 2: Convert to fraction form
    42,912,138.40/64,368,207.60 = 18,678,428.80/x
  3. Step 3: Cross multiply
    42,912,138.40x = 64,368,207.60 × 18,678,428.80
  4. Step 4: Simplify right side
    42,912,138.40x = 1,202,296,982,640,219
  5. Step 5: Solve for x
    x = 1,202,296,982,640,219/42,912,138.40
  6. Step 6: Final answer
    x = 28,017,643.20

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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.