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Finding the Fourth Proportional to 1,398,938.40, 2,093,569.20 and 838,375.20

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Solution

The fourth proportional to 1,398,938.40, 2,093,569.20 and 838,375.20 is: 1,254,663.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398,938.40 : 2,093,569.20 = 838,375.20 : x
  2. Step 2: Convert to fraction form
    1,398,938.40/2,093,569.20 = 838,375.20/x
  3. Step 3: Cross multiply
    1,398,938.40x = 2,093,569.20 × 838,375.20
  4. Step 4: Simplify right side
    1,398,938.40x = 1,755,196,496,763.84
  5. Step 5: Solve for x
    x = 1,755,196,496,763.84/1,398,938.40
  6. Step 6: Final answer
    x = 1,254,663.18

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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.