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Finding the Fourth Proportional to 572,897.21, 790,620.59 and 391,988.57

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Solution

The fourth proportional to 572,897.21, 790,620.59 and 391,988.57 is: 540,959.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    572,897.21 : 790,620.59 = 391,988.57 : x
  2. Step 2: Convert to fraction form
    572,897.21/790,620.59 = 391,988.57/x
  3. Step 3: Cross multiply
    572,897.21x = 790,620.59 × 391,988.57
  4. Step 4: Simplify right side
    572,897.21x = 309,914,234,486.66
  5. Step 5: Solve for x
    x = 309,914,234,486.66/572,897.21
  6. Step 6: Final answer
    x = 540,959.58

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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.