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Finding the Fourth Proportional to 631,695.47, 871,742.07 and 345,215.61

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Solution

The fourth proportional to 631,695.47, 871,742.07 and 345,215.61 is: 476,398.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    631,695.47 : 871,742.07 = 345,215.61 : x
  2. Step 2: Convert to fraction form
    631,695.47/871,742.07 = 345,215.61/x
  3. Step 3: Cross multiply
    631,695.47x = 871,742.07 × 345,215.61
  4. Step 4: Simplify right side
    631,695.47x = 300,938,970,457.71
  5. Step 5: Solve for x
    x = 300,938,970,457.71/631,695.47
  6. Step 6: Final answer
    x = 476,398.81

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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.