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Finding the Fourth Proportional to 438,641.80, 657,962.70 and 391,985.80

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Solution

The fourth proportional to 438,641.80, 657,962.70 and 391,985.80 is: 587,978.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,641.80 : 657,962.70 = 391,985.80 : x
  2. Step 2: Convert to fraction form
    438,641.80/657,962.70 = 391,985.80/x
  3. Step 3: Cross multiply
    438,641.80x = 657,962.70 × 391,985.80
  4. Step 4: Simplify right side
    438,641.80x = 257,912,035,329.66
  5. Step 5: Solve for x
    x = 257,912,035,329.66/438,641.80
  6. Step 6: Final answer
    x = 587,978.70

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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.