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Finding the Fourth Proportional to 665,426.07, 918,290.48 and 420,519.66

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Solution

The fourth proportional to 665,426.07, 918,290.48 and 420,519.66 is: 580,318.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,426.07 : 918,290.48 = 420,519.66 : x
  2. Step 2: Convert to fraction form
    665,426.07/918,290.48 = 420,519.66/x
  3. Step 3: Cross multiply
    665,426.07x = 918,290.48 × 420,519.66
  4. Step 4: Simplify right side
    665,426.07x = 386,159,200,430.84
  5. Step 5: Solve for x
    x = 386,159,200,430.84/665,426.07
  6. Step 6: Final answer
    x = 580,318.71

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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.