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Finding the Fourth Proportional to 217,220.60, 325,830.90 and 213,721.40

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Solution

The fourth proportional to 217,220.60, 325,830.90 and 213,721.40 is: 320,582.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,220.60 : 325,830.90 = 213,721.40 : x
  2. Step 2: Convert to fraction form
    217,220.60/325,830.90 = 213,721.40/x
  3. Step 3: Cross multiply
    217,220.60x = 325,830.90 × 213,721.40
  4. Step 4: Simplify right side
    217,220.60x = 69,637,036,111.26
  5. Step 5: Solve for x
    x = 69,637,036,111.26/217,220.60
  6. Step 6: Final answer
    x = 320,582.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.