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Finding the Fourth Proportional to 457,307.40, 686,738.70 and 339,112.20

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Solution

The fourth proportional to 457,307.40, 686,738.70 and 339,112.20 is: 509,244.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    457,307.40 : 686,738.70 = 339,112.20 : x
  2. Step 2: Convert to fraction form
    457,307.40/686,738.70 = 339,112.20/x
  3. Step 3: Cross multiply
    457,307.40x = 686,738.70 × 339,112.20
  4. Step 4: Simplify right side
    457,307.40x = 232,881,471,382.14
  5. Step 5: Solve for x
    x = 232,881,471,382.14/457,307.40
  6. Step 6: Final answer
    x = 509,244.92

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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.