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Finding the Fourth Proportional to 209,613.40, 315,832.48 and 172,993.72

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Solution

The fourth proportional to 209,613.40, 315,832.48 and 172,993.72 is: 260,656.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,613.40 : 315,832.48 = 172,993.72 : x
  2. Step 2: Convert to fraction form
    209,613.40/315,832.48 = 172,993.72/x
  3. Step 3: Cross multiply
    209,613.40x = 315,832.48 × 172,993.72
  4. Step 4: Simplify right side
    209,613.40x = 54,637,035,612.03
  5. Step 5: Solve for x
    x = 54,637,035,612.03/209,613.40
  6. Step 6: Final answer
    x = 260,656.22

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.