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Finding the Fourth Proportional to 1,287,428,978.28, 1,777,281,830.28 and 863,891,102.82

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Solution

The fourth proportional to 1,287,428,978.28, 1,777,281,830.28 and 863,891,102.82 is: 1,192,592,357.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287,428,978.28 : 1,777,281,830.28 = 863,891,102.82 : x
  2. Step 2: Convert to fraction form
    1,287,428,978.28/1,777,281,830.28 = 863,891,102.82/x
  3. Step 3: Cross multiply
    1,287,428,978.28x = 1,777,281,830.28 × 863,891,102.82
  4. Step 4: Simplify right side
    1,287,428,978.28x = 1,535,377,960,382,537,216
  5. Step 5: Solve for x
    x = 1,535,377,960,382,537,216/1,287,428,978.28
  6. Step 6: Final answer
    x = 1,192,592,357.55

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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.