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Finding the Fourth Proportional to 642,644.12, 886,646.25 and 370,675.55

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Solution

The fourth proportional to 642,644.12, 886,646.25 and 370,675.55 is: 511,415.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,644.12 : 886,646.25 = 370,675.55 : x
  2. Step 2: Convert to fraction form
    642,644.12/886,646.25 = 370,675.55/x
  3. Step 3: Cross multiply
    642,644.12x = 886,646.25 × 370,675.55
  4. Step 4: Simplify right side
    642,644.12x = 328,658,086,374.19
  5. Step 5: Solve for x
    x = 328,658,086,374.19/642,644.12
  6. Step 6: Final answer
    x = 511,415.38

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Double scale
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1.5x scale

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.