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Finding the Fourth Proportional to 620,700.72, 856,297.08 and 391,118.64

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Solution

The fourth proportional to 620,700.72, 856,297.08 and 391,118.64 is: 539,573.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,700.72 : 856,297.08 = 391,118.64 : x
  2. Step 2: Convert to fraction form
    620,700.72/856,297.08 = 391,118.64/x
  3. Step 3: Cross multiply
    620,700.72x = 856,297.08 × 391,118.64
  4. Step 4: Simplify right side
    620,700.72x = 334,913,749,365.57
  5. Step 5: Solve for x
    x = 334,913,749,365.57/620,700.72
  6. Step 6: Final answer
    x = 539,573.64

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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.