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Finding the Fourth Proportional to 631,658.80, 871,778.04 and 402,142.78

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Solution

The fourth proportional to 631,658.80, 871,778.04 and 402,142.78 is: 555,013.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    631,658.80 : 871,778.04 = 402,142.78 : x
  2. Step 2: Convert to fraction form
    631,658.80/871,778.04 = 402,142.78/x
  3. Step 3: Cross multiply
    631,658.80x = 871,778.04 × 402,142.78
  4. Step 4: Simplify right side
    631,658.80x = 350,579,244,548.55
  5. Step 5: Solve for x
    x = 350,579,244,548.55/631,658.80
  6. Step 6: Final answer
    x = 555,013.63

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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.