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Finding the Fourth Proportional to 665,370.61, 918,189.52 and 420,486.23

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Solution

The fourth proportional to 665,370.61, 918,189.52 and 420,486.23 is: 580,257.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,370.61 : 918,189.52 = 420,486.23 : x
  2. Step 2: Convert to fraction form
    665,370.61/918,189.52 = 420,486.23/x
  3. Step 3: Cross multiply
    665,370.61x = 918,189.52 × 420,486.23
  4. Step 4: Simplify right side
    665,370.61x = 386,086,050,934.57
  5. Step 5: Solve for x
    x = 386,086,050,934.57/665,370.61
  6. Step 6: Final answer
    x = 580,257.15

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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.