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Finding the Fourth Proportional to 631,678.64, 871,436.52 and 376,881.68

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Solution

The fourth proportional to 631,678.64, 871,436.52 and 376,881.68 is: 519,929.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    631,678.64 : 871,436.52 = 376,881.68 : x
  2. Step 2: Convert to fraction form
    631,678.64/871,436.52 = 376,881.68/x
  3. Step 3: Cross multiply
    631,678.64x = 871,436.52 × 376,881.68
  4. Step 4: Simplify right side
    631,678.64x = 328,428,459,670.95
  5. Step 5: Solve for x
    x = 328,428,459,670.95/631,678.64
  6. Step 6: Final answer
    x = 519,929.66

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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.