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Finding the Fourth Proportional to 631,659.80, 871,779.42 and 402,143.78

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Solution

The fourth proportional to 631,659.80, 871,779.42 and 402,143.78 is: 555,015.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    631,659.80 : 871,779.42 = 402,143.78 : x
  2. Step 2: Convert to fraction form
    631,659.80/871,779.42 = 402,143.78/x
  3. Step 3: Cross multiply
    631,659.80x = 871,779.42 × 402,143.78
  4. Step 4: Simplify right side
    631,659.80x = 350,580,671,285.01
  5. Step 5: Solve for x
    x = 350,580,671,285.01/631,659.80
  6. Step 6: Final answer
    x = 555,015.01

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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.