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Finding the Fourth Proportional to 385,359.80, 578,039.70 and 369,613.40

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Solution

The fourth proportional to 385,359.80, 578,039.70 and 369,613.40 is: 554,420.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,359.80 : 578,039.70 = 369,613.40 : x
  2. Step 2: Convert to fraction form
    385,359.80/578,039.70 = 369,613.40/x
  3. Step 3: Cross multiply
    385,359.80x = 578,039.70 × 369,613.40
  4. Step 4: Simplify right side
    385,359.80x = 213,651,218,851.98
  5. Step 5: Solve for x
    x = 213,651,218,851.98/385,359.80
  6. Step 6: Final answer
    x = 554,420.10

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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.