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Finding the Fourth Proportional to 711,000.42, 981,180.49 and 388,710.43

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Solution

The fourth proportional to 711,000.42, 981,180.49 and 388,710.43 is: 536,420.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    711,000.42 : 981,180.49 = 388,710.43 : x
  2. Step 2: Convert to fraction form
    711,000.42/981,180.49 = 388,710.43/x
  3. Step 3: Cross multiply
    711,000.42x = 981,180.49 × 388,710.43
  4. Step 4: Simplify right side
    711,000.42x = 381,395,090,175.51
  5. Step 5: Solve for x
    x = 381,395,090,175.51/711,000.42
  6. Step 6: Final answer
    x = 536,420.34

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Double scale
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1.5x scale

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.