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Finding the Fourth Proportional to 679,290.12, 937,400.67 and 388,891.98

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Solution

The fourth proportional to 679,290.12, 937,400.67 and 388,891.98 is: 536,659.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    679,290.12 : 937,400.67 = 388,891.98 : x
  2. Step 2: Convert to fraction form
    679,290.12/937,400.67 = 388,891.98/x
  3. Step 3: Cross multiply
    679,290.12x = 937,400.67 × 388,891.98
  4. Step 4: Simplify right side
    679,290.12x = 364,547,602,609.63
  5. Step 5: Solve for x
    x = 364,547,602,609.63/679,290.12
  6. Step 6: Final answer
    x = 536,659.66

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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.