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Finding the Fourth Proportional to 1,287,934.80, 1,931,815.80 and 341,285.20

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Solution

The fourth proportional to 1,287,934.80, 1,931,815.80 and 341,285.20 is: 511,904.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287,934.80 : 1,931,815.80 = 341,285.20 : x
  2. Step 2: Convert to fraction form
    1,287,934.80/1,931,815.80 = 341,285.20/x
  3. Step 3: Cross multiply
    1,287,934.80x = 1,931,815.80 × 341,285.20
  4. Step 4: Simplify right side
    1,287,934.80x = 659,300,141,666.16
  5. Step 5: Solve for x
    x = 659,300,141,666.16/1,287,934.80
  6. Step 6: Final answer
    x = 511,904.91

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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.