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Finding the Fourth Proportional to 520,699.18, 780,895.66 and 221,177.38

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Solution

The fourth proportional to 520,699.18, 780,895.66 and 221,177.38 is: 331,701.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,699.18 : 780,895.66 = 221,177.38 : x
  2. Step 2: Convert to fraction form
    520,699.18/780,895.66 = 221,177.38/x
  3. Step 3: Cross multiply
    520,699.18x = 780,895.66 × 221,177.38
  4. Step 4: Simplify right side
    520,699.18x = 172,716,456,132.17
  5. Step 5: Solve for x
    x = 172,716,456,132.17/520,699.18
  6. Step 6: Final answer
    x = 331,701.03

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.