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Finding the Fourth Proportional to 779,016, 1,075,042.08 and 421,320

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Solution

The fourth proportional to 779,016, 1,075,042.08 and 421,320 is: 581,421.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    779,016 : 1,075,042.08 = 421,320 : x
  2. Step 2: Convert to fraction form
    779,016/1,075,042.08 = 421,320/x
  3. Step 3: Cross multiply
    779,016x = 1,075,042.08 × 421,320
  4. Step 4: Simplify right side
    779,016x = 452,936,729,145.60
  5. Step 5: Solve for x
    x = 452,936,729,145.60/779,016
  6. Step 6: Final answer
    x = 581,421.60

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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.