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Finding the Fourth Proportional to 642,133.61, 886,142.43 and 355,653.62

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Solution

The fourth proportional to 642,133.61, 886,142.43 and 355,653.62 is: 490,800.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,133.61 : 886,142.43 = 355,653.62 : x
  2. Step 2: Convert to fraction form
    642,133.61/886,142.43 = 355,653.62/x
  3. Step 3: Cross multiply
    642,133.61x = 886,142.43 × 355,653.62
  4. Step 4: Simplify right side
    642,133.61x = 315,159,761,957.42
  5. Step 5: Solve for x
    x = 315,159,761,957.42/642,133.61
  6. Step 6: Final answer
    x = 490,800.91

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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.