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Finding the Fourth Proportional to 521,115.50, 719,139.40 and 282,651.50

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Solution

The fourth proportional to 521,115.50, 719,139.40 and 282,651.50 is: 390,059.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,115.50 : 719,139.40 = 282,651.50 : x
  2. Step 2: Convert to fraction form
    521,115.50/719,139.40 = 282,651.50/x
  3. Step 3: Cross multiply
    521,115.50x = 719,139.40 × 282,651.50
  4. Step 4: Simplify right side
    521,115.50x = 203,265,830,119.10
  5. Step 5: Solve for x
    x = 203,265,830,119.10/521,115.50
  6. Step 6: Final answer
    x = 390,059.08

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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.