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Finding the Fourth Proportional to 917,018.40, 1,372,903.20 and 812,042.40

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Solution

The fourth proportional to 917,018.40, 1,372,903.20 and 812,042.40 is: 1,215,739.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    917,018.40 : 1,372,903.20 = 812,042.40 : x
  2. Step 2: Convert to fraction form
    917,018.40/1,372,903.20 = 812,042.40/x
  3. Step 3: Cross multiply
    917,018.40x = 1,372,903.20 × 812,042.40
  4. Step 4: Simplify right side
    917,018.40x = 1,114,855,609,495.68
  5. Step 5: Solve for x
    x = 1,114,855,609,495.68/917,018.40
  6. Step 6: Final answer
    x = 1,215,739.63

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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.