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Finding the Fourth Proportional to 1,399,793.52, 1,931,715.54 and 819,128.28

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Solution

The fourth proportional to 1,399,793.52, 1,931,715.54 and 819,128.28 is: 1,130,397.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,399,793.52 : 1,931,715.54 = 819,128.28 : x
  2. Step 2: Convert to fraction form
    1,399,793.52/1,931,715.54 = 819,128.28/x
  3. Step 3: Cross multiply
    1,399,793.52x = 1,931,715.54 × 819,128.28
  4. Step 4: Simplify right side
    1,399,793.52x = 1,582,322,827,729.47
  5. Step 5: Solve for x
    x = 1,582,322,827,729.47/1,399,793.52
  6. Step 6: Final answer
    x = 1,130,397.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.