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Finding the Fourth Proportional to 642,284.78, 886,340.80 and 355,807.22

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Solution

The fourth proportional to 642,284.78, 886,340.80 and 355,807.22 is: 491,007.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,284.78 : 886,340.80 = 355,807.22 : x
  2. Step 2: Convert to fraction form
    642,284.78/886,340.80 = 355,807.22/x
  3. Step 3: Cross multiply
    642,284.78x = 886,340.80 × 355,807.22
  4. Step 4: Simplify right side
    642,284.78x = 315,366,457,346.91
  5. Step 5: Solve for x
    x = 315,366,457,346.91/642,284.78
  6. Step 6: Final answer
    x = 491,007.21

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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.