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Finding the Fourth Proportional to 642,626.21, 886,854.06 and 356,146.32

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Solution

The fourth proportional to 642,626.21, 886,854.06 and 356,146.32 is: 491,498.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,626.21 : 886,854.06 = 356,146.32 : x
  2. Step 2: Convert to fraction form
    642,626.21/886,854.06 = 356,146.32/x
  3. Step 3: Cross multiply
    642,626.21x = 886,854.06 × 356,146.32
  4. Step 4: Simplify right side
    642,626.21x = 315,849,809,846.06
  5. Step 5: Solve for x
    x = 315,849,809,846.06/642,626.21
  6. Step 6: Final answer
    x = 491,498.49

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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.